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
(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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