12th Chemistry Sura Guide

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12th Chemistry Sura Guide. We covered all the 12th Chemistry Sura Guide MCQs in this post for free so that you can practice well for the exam.

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12th Chemistry Sura Guide Objective for Students

Sodium phenate reacts with acetyl chloride to form:

(A) Methyl benzoate

(B) Acetyl phenol

(C) Phenylacetate

(D) Chlorobenzene

Option c – Phenylacetate

Which of the following is not a phenolic compound ( 12th Chemistry Sura Guide MCQ )

(A) Salol

(B) o-Cresol

(C) Anisole

(D) Quinol

Option c – Anisole

An unacceptable name for a compound containing one -OH group attached to the benzene nucleus would be:

(A) Carbolic acid

(B) Hydroxybenzene

(C) Catechol

(D) Phenol

Option c – Catechol

Isopropyl alcohol on oxidation gives ( 12th Chemistry Sura Guide MCQ )

(A) Acetone

(B) Acetaldehyde

(C) Ether

(D) Ethylene

Option a – Acetone

The highest boiling point is of:

(A) Ethanol

(B) Ether

(C) Alkane

(D) Aldehyde

Option a – Ethanol

In the reaction of glucose → ethyl alcohol, the enzyme involved is ( 12th Chemistry Sura Guide MCQ )

(A) Zymase

(B) Invertase

(C) Maltase

(D) Diastase

Option a – Zymase

Which compound has the highest boiling point?

(A) Acetone

(B) Diethyl ether

(C) Methanol

(D) Ethanol

Option d – Ethanol

Reimer-Tiemann reaction involves ( 12th Chemistry Sura Guide MCQ )

(A) Carbanion intermediate

(B) A carbene intermediate

(C) Carbonium ion intermediate

(D) Free radical intermediate

Option b – A carbene intermediate

Phenol with Hinsberg’s reagent gives:

(A) Sulphone

(B) Sulphanilic acid

(C) Sulphonic ester

(D) Sulphonal

Option c – Sulphonic ester

Electrophilic substitution reactions in phenol take place at ( 12th Chemistry Sura Guide MCQ )

(A) p-position

(B) m-position

(C) o-position

(D) o- and p-positions

Option d – o- and p-positions

Condensation of phenol and phthalic anhydride gives:

(A) Methyl orange

(B) Phenol red

(C) Salicylic acid

(D) Phenolphthalein

Option d – Phenolphthalein

The major product obtained from the interaction of phenol with sodium hydroxide and carbon dioxide is ( 12th Chemistry Sura Guide MCQ )

(A) Salicylaldehyde

(B) Salicylic acid

(C) Phthalic acid

(D) Benzoic acid

Option b – Salicylic acid

Phenyl magnesium bromide on reacting with ethanol forms:

(A) Phenol

(B) Benzene

(C) Ethane

(D) Isopropyl phenyl ether

Option b – Benzene

In Williamson’s synthesis, ethoxyethane is prepared by ( 12th Chemistry Sura Guide MCQ )

(A) Passing ethanol over heated alumina

(B) Sodium ethoxide with ethyl bromide

(C) Ethyl alcohol with sulfuric acid

(D) Ethyl iodide and dry silver oxide

Option b – Sodium ethoxide with ethyl bromide

Ethyl chloride is converted into diethyl ether by:

(A) Wurtz synthesis

(B) Grignard reaction

(C) Perkin’s reaction

(D) Williamson’s synthesis

Option d – Williamson’s synthesis

In Williamson’s synthesis for diethyl ether, which species works as a nucleophile ( 12th Chemistry Sura Guide MCQ )

(A) Halide ion

(B) Ethoxide ion

(C) Ethyde ion

(D) Hydride ion

Option b – Ethoxide ion

The preparation of ethers from alcohols by using sulfuric acid is called:

(A) Williamson’s ether synthesis

(B) Williamson’s continuous etherification process

(C) Ziesel’s method

(D) Zerewitinoff method

Option b – Williamson’s continuous etherification process

The reaction of ethyl iodide with sodium ethoxide is ( 12th Chemistry Sura Guide MCQ )

(A) An electrophilic substitution reaction

(B) A nucleophilic addition reaction

(C) A nucleophilic substitution reaction

(D) A free radical substitution reaction

Option c – A nucleophilic substitution reaction

The first member of the ether series on reaction with sodium and liquified ammonia gives:

(A) Methanol + methane

(B) Ethane + methanol

(C) Ethanol

(D) Ethane

Option a – Methanol + methane

Mark the correct statement ( 12th Chemistry Sura Guide MCQ )

(A) Ethers behave as Lewis base

(B) Ethers form coordination complexes with Lewis acids

(C) With cold HI diethyl ether gives ethyl alcohol & ethyl iodide

(D) All are correct

Option d – All are correct

Ether on carbonylation gives:

(A) Alkanoic acid

(B) Alkanone

(C) Alkyl alkanoate

(D) Alkanal

Option c – Alkyl alkanoate

Diethyl ether absorbs oxygen to form ( 12th Chemistry Sura Guide MCQ )

(A) Red-colored sweet-smelling compound

(B) Acetic acid

(C) Ether suboxide

(D) Ether peroxide

Option d – Ether peroxide

Diethyl ether and air give ether-hydroperoxide. The mechanism of the reaction is:

(A) Nucleophilic substitution

(B) Free radical addition

(C) Free radical substitution

(D) None of the above

Option b – Free radical addition

The order of reactivity of halogen acids with ether is ( 12th Chemistry Sura Guide MCQ )

(A) HCl > HBr > HI

(B) HI > HBr > HCl

(C) HCl > HI > HBr

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(D) HI > HCl > HBr

Option b – HI > HBr > HCl

Isopropyl n-propyl ether is obtained by reacting 1-bromopropane with:

(A) Sodium ‘n-propoxide

(B) Sodium ethoxide

(C) Sodium isopropoxide

(D) Sodium bromide

Option c – Sodium isopropoxide

Ethyl acetate is prepared from ( 12th Chemistry Sura Guide MCQ )

(A) Silver methanoate and methyl alcohol

(B) Silver ethanoate and ethyl alcohol

(C) Silver methanoate and ethanol

(D) Silver ethanoate and ethyl bromide

Option d – Silver ethanoate and ethyl bromide

During the dehydrohalogenation of haloalkanes, the formation of the major product is decided on the basis of:

(A) Popff’s rule

(B) Saytzeff’s rule

(C) Peroxide rule

(D) Markonikoff’s rule

Option b – Saytzeff’s rule

Elimination of HI from 2-iodo-2-methylbutane forms ( 12th Chemistry Sura Guide MCQ )

(A) 2-Methylbut-2-ene

(B) 2-Methylbut-1-ene

(C) 3-Methylbut-1-ene

(D) Isopentyl alcohol

Option a – 2-Methylbut-2-ene

Organometallic compounds must have:

(A) Carbon-Oxygen bond

(B) Carbon-Metal bond

(C) Metal-Halogen bond

(D) Non-Metal atom

Option b – Carbon-Metal bond

Isopropyl iodide, on heating with excess alcoholic ammonia, produces:

(A) Trimethylamine

(B) Diethylamine

(C) Propan-1-amine

(D) Propan-2-amine

Option d – Propan-2-amine

1-Bromopropane, on boiling with alcoholic potassium nitrite, gives:

(A) 1-Nitropropane

(B) 2-Nitropropanate

(C) n-Propyl nitrite

(D) Sec-propyl nitrite

Option c – n-Propyl nitrite

During the alkaline hydrolysis of d-3-chloro-3-methylhexane, the product formed is:

(A) Levo rotatory

(B) Dextro rotatory

(C) No rotation

(D) Optically inactive

Option d – Optically inactive

Benzene, on reacting with bromine in the presence of Fe, produces:

(A) Benzyl bromide

(B) Bromobenzene

(C) o-Bromobenzene

(D) m-Bromobenzene

Option b – Bromobenzene

When chlorobenzene reacts with acetyl chloride, it gives:

(A) p-Chloroacetophenone

(B) Chloroacetobenzene

(C) Acetophenyl chloride

(D) Methyl aceto chlorobenzene

Option a – p-Chloroacetophenone

The transition state is defined as the state of a reaction, which contains:

(A) Potential energy

(B) Maximum energy

(C) Zero energy

(D) Minimum energy

Option b – Maximum energy

The oxidation product of trichloromethane is:

(A) Phosgene

(B) Sulphonyl chloride

(C) Ethane

(D) Dichloromethane

Option a – Phosgene

Which of the following can damage the cornea on direct contact?

(A) Trichloromethane

(B) Dichloromethane

(C) Tetrachloromethane

(D) Dichlorodifluoromethane

Option b – Dichloromethane

The reaction between haloalkane and haloarenes to give alkylbenzene in the presence of sodium metal is:

(A) Groove’s reaction

(B) Wurtz reaction

(C) Fittig’s reaction

(D) Wurtz-Fittig reaction

Option d – Wurtz-Fittig reaction

The temperature required to convert 1-chloro-4-nitrobenzene into 4-nitrophenol is:

(A) 433K

(B) 623K

(C) 443K

(D) 523K

Option a – 433K

Which of the following groups increases the rate of alkaline hydrolysis of haloarenes?

(A) Nitro group

(B) Alkyl radical

(C) Electron-donating

(D) Electron-repelling

Option a – Nitro group

Electrophilic substitution in phenyl chloride is possible due to:

(A) Positive inductive effect of the halogen atom

(B) Negative inductive effect of the halogen atom

(C) Positive resonance effect of the halogen atom

(D) Negative resonance effect of the halogen atom

Option c – Positive resonance effect of the halogen atom

Major chlorination product of chlorobenzene is:

(A) 1,2-dichlorobenzene

(B) p-dichlorobenzene

(C) 1,3-dichlorobenzene

(D) o-dichlorobenzene

Option b – p-dichlorobenzene

Conversion of benzene into phenyl bromide is:

(A) Electrophilic addition reaction

(B) Electrophilic substitution reaction

(C) Nucleophilic addition reaction

(D) Nucleophilic substitution reaction

Option b – Electrophilic substitution reaction

Phenyl amine reacts with sodium nitrite and dil. hydrochloric acid produces:

(A) Chlorobenzene

(B) Benzene diazonium chloride

(C) Phenyl ammonium chloride

(D) Benzyl chloride

Option b – Benzene diazonium chloride

Geminal and vicinal dihalides are:

(A) Chain isomerism

(B) Position isomerism

(C) Electrophilic addition

(D) Nucleophilic addition

Option b – Position isomerism

For the preparation of propane nitrile from bromoethane, the other reactant is:

(A) HCN

(B) HNC

(C) KCN

(D) AgCN

Option c – KCN

Chlorination of methane is:

(A) Electrophilic substitution

(B) Nucleophilic substitution

(C) Free radical substitution

(D) Nucleophilic addition

Option c – Free radical substitution

Major acylation product of chlorobenzene is:

(A) 4-Chloro acetophenone

(B) 3-Chloro acetophenone

(C) 2-Chloro acetophenone

(D) m-Chloro acetophenone

Option a – 4-Chloro acetophenone

Reaction of n-butyl bromide with sodium methoxide produces mainly:

(A) Isobutane

(B) Isobutylene

(C) Sodium tert-butoxide

(D) n-Butyl methyl ether

Option d – n-Butyl methyl ether

Polysubstitution is a major drawback in:

(A) Reimer Tiemann reaction

(B) Acetylation of aniline

(C) Friedel Craft’s acylation

(D) Friedel Craft’s alkylation

Option d – Friedel Craft’s alkylation

Polyhalogen derivative used as antiseptic is:

(A) Dichloromethane

(B) Trichloromethane

(C) Tri-iodomethane

(D) Tetrachloromethane

Option c – Tri-iodomethane

Which of the following alkanes cannot be made in good yield by the Wurtz reaction?

(A) n-Butane

(B) n-Hexane

(C) 2,3-dimethylbutane

(D) n-Heptane

Option d – n-Heptane

Major product formed on the reaction of 2-bromobutane with KOH (alc.) is:

(A) But-1-ene

(B) But-2-ene

(C) Butan-2-ol

(D) Butan-1-ol

Option b – But-2-ene

The optically inactive compound from the following is:

(A) 2-Chloropentane

(B) 2-Chloropropanal

(C) 2-Chloro-2-methylbutane

(D) 2-Chlorobutane

Option c – 2-Chloro-2-methylbutane

IUPAC name of westron is:

(A) 1,1,2,2-tetrachloroethene

(B) 1,1,2,2-tetrachloroethane

(C) 1,2-dichloroethyne

(D) 1,3,3,3-tetrachloroprop-1-yne

Option b – 1,1,2,2-tetrachloroethane

The synthesis of alkyl fluorides is best accomplished by:

(A) Free radical fluorination

(B) Sandmeyer’s reaction

(C) Finkelstein reaction

(D) Swarts reaction

Option d – Swarts reaction

In alkaline hydrolysis of t-butyl bromide, the order of reaction with respect to nucleophile is:

(A) zero

(B) first

(C) pseudo

(D) second

Option b – first

A solution of (-)-1-chloro-1-phenylethane in toluene racemizes slowly in the presence of a small amount of SbCl3 due to the formation of:

(A) Carbanion

(B) Carbene

(C) Carbocation

(D) Free radical

Option c – Carbocation

Iodoform can be prepared from all except:

(A) Isobutyl alcohol

(B) Ethyl methyl ketone

(C) Isopropyl alcohols

(D) 3-Methyl-2-butanone

Option a – Isobutyl alcohol

Which of the following on hydrolysis forms a racemate?

(A) Chloromethane

(B) 2-Iodobutane

(C) 2,-2-Dimethyl propane

(D) 1-Bromo-1-phenylethane

Option b – 2-Iodobutane

Which of the following compounds leads to the formation of a racemate on alkaline hydrolysis?

(A) 1-Bromo-1-phenyl ethane

(B) 1-Chloro-3-methyl butane

(C) Bromo ethane

(D) 1-Chloro propane

Option a – 1-Bromo-1-phenyl ethane

Both geometrical and optical isomerism are exhibited by:

(A) Dichloro(ethylenediamine)cobalt(III) ion

(B) Pentaaminechlorocobalt(III)

(C) Triamminetrichlorocobalt(III) ion

(D) Trioxalatochromate(III) ion

Option a – Dichloro(ethylenediamine)cobalt(III) ion

The effective atomic number of cobalt in the complex is:

(A) 36

(B) 33

(C) 24

(D) 30

Option a – 36

The EAN of iron in potassium ferricyanide is:

(A) 18

(B) 35

(C) 54

(D) 23

Option b – 35

An example of a sigma-bonded organometallic compound is:

(A) Grignard’s reagent

(B) Ferrocene

(C) Cobaltocene

(D) Ruthenocene

Option a – Grignard’s reagent

Which of the following coordination compounds would exhibit optical isomerism?

(A) trans-dicyanobis(ethylenediamine)chromium(III) chloride

(B) Tris-(ethylenediamine)cobalt(III)bromide

(C) Pentaamminenitrocobalt(III)iodide

(D) Diamminedichloroplatinum(II)

Option b – Tris-(ethylenediamine)cobalt(III)bromide

According to IUPAC nomenclature, sodium nitroprusside is named:

(A) Sodium pentacyanonitrosyl ferrate(III)

(B) Sodium nitroferricyamide

(C) Sodium nitroferrocyanide

(D) Sodium pentacyanonitrosyl ferrate(II)

Option a – Sodium pentacyanonitrosyl ferrate(III)

Ligands used in the estimation of hardness of water are:

(A) EDTA

(B) DMG

(C) Chloride

(D) Bromo

Option a – EDTA

Cis-platin is used in the treatment of:

(A) Malaria

(B) Cancer

(C) AIDS

(D) Yellow fever

Option b – Cancer

Which of the following compounds reacts with Lucas reagent on heating to give turbidity and a color change?

(A) n-propyl alcohol

(B) isopropyl alcohol

(C) tert-butyl alcohol

(D) sec-butyl alcohol

Option a – n-propyl alcohol

Primary, secondary, and tertiary alcohols can be distinguished from each other in the laboratory using:

(A) Finkelstein reagent

(B) Darzens reagent

(C) Wurtz reagent

(D) Lucas reagent

Option d – Lucas reagent

Acetonitrile’s functional isomer is:

(A) methenamine

(B) Methyl isocyanide

(C) Methanamide

(D) Methyl alcohol

Option b – Methyl isocyanide

Which of the following pairs is composed of optical isomers?

(A) n-butyl chloride and isobutyl chloride

(B) isobutyl chloride and sec-butyl chloride

(C) secondary butyl chloride and tert-butyl chloride

(D) d-sec-butyl chloride and l-sec-butyl chloride

Option d – d-sec-butyl chloride and l-sec-butyl chloride

When propene is heated with Br2 at 400-600°C, it produces:

(A) 1,2-dibromopropane

(B) 2-bromopropane

(C) allyl bromide

(D) 1-bromopropane

Option c – allyl bromide

Allyl bromide is prepared by the action of N-bromo-succinimide and what?

(A) Propene

(B) Ethene

(C) But-1-ene

(D) But-2-ene

Option a – Propene

During the iodination of a hydrocarbon using mercuric oxide, it is reduced to:

(A) Alkane (hydrocarbon)

(B) Water

(C) Iodine

(D) Mercuric iodide

Option d – Mercuric iodide

The preparation of isopropyl bromide from propene is a:

(A) Free radical addition reaction

(B) Electrophilic addition reaction

(C) Nucleophilic substitution reaction

(D) Nucleophilic addition reaction

Option b – Electrophilic addition reaction

The addition of HBr to α-butylene in the presence of benzoyl peroxide is a:

(A) Nucleophilic addition reaction

(B) Free radical substitution reaction

(C) Electrophilic addition reaction

(D) Free radical addition reaction

Option d – Free radical addition reaction

Isobutyl alcohol is heated with Lucas reagent to form

(A) Isobutyl chloride

(B) sec.butyl chloride

(C) tert.butyl chloride

(D) isopropyl chloride

Option c – tert.butyl chloride

Markonikov’s rule is followed by the addition of ……. an alkene under normal conditions.

(A) HCl

(B) HBr

(C) HI

(D) All of the above

Option d – All of the above

Mayo effect can be observed in which of the following reactions?

(A) Hydrogenation of alkene

(B) Halogenation of alkane

(C) Hydrohalogenation of alkene

(D) Williamson synthesis

Option c – Hydrohalogenation of alkene

During the chlorination of methyl benzene, the major product obtained is

(A) p-Chloro toluene

(B) 2-chloro toluene

(C) m-Chloro toluene

(D) o-chloro toluene

Option a – p-Chloro toluene

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