Alcohols Phenols and Ethers NEET Questions

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Alcohols Phenols and Ethers NEET Objective Questions for Students

Alcohol which gives a red color with the Victor Meyer test is :

(A) C₂H5OH

(B) CH3-CH(OH)-CH3

(C) C(CH3)3OH

(D) None of the above

Option a – C₂H5OH

When acetone reacts with the Grignard reagent it gives

(A) 1° -alcohol

(B) 2° -alcohol

(C) 3° -alcohol

(D) Methyl alcohol

Option c – 3° -alcohol

Consider the following reaction: C2H5OH + H2SO4 → Produce Among the following, which one cannot be formed as a product under any conditions?

(A) Ethyl-hydrogen sulfate

(B) Ethylene

(C) Acetylene

(D) Diethyl ether

Option c – Acetylene

Which of the following reactions of alcohol does not involve O – H bond breaking :

(A) Reaction with alkali metals

(B) Reaction with an acyl chloride

(C) Reaction with sulphonyl chloride

(D) Reaction with conc. sulphuric acid

Option d – Reaction with conc. sulphuric acid

An organic compound dissolved in dry benzene evolved hydrogen on treatment with sodium. It is

(A) A ketone

(B) An aldehyde

(C) A tertiary amine

(D) An alcohol

Option d – An alcohol

When ethyl alcohol reacts with acetic acid, the products formed are

(A) Sodium ethoxide + hydrogen

(B) Ethyl acetate + water

(C) Ethyl acetate + soap

(D) Ethyl alcohol + water

Option b – Ethyl acetate + water

Methyl alcohol reacts with phosphorus trichloride to form

(A) Methane

(B) Methyl chloride

(C) Acetyl chloride

(D) Dimethyl ether

Option b – Methyl chloride

The -OH group of methyl alcohol cannot be replaced by chlorine by the action of

(A) Chlorine

(B) Hydrogen chloride

(C) Phosphorus trichloride

(D) Phosphorus pentachloride

Option a – Chlorine

Hydrogen bonding is possible in

(A) Ethers

(B) Hydrocarbons

(C) Alkanes

(D) Alcohols

Option d – Alcohols

The increasing order of boiling points of 1º, 2º, 3° alcohol is

(A) 1° 2° > 3⁰

(B) 3° 2° > 1°

(C) 2° > 1°> 3°

(D) None

Option a – 1° 2° > 3⁰

The solubility of lower alcohols in water is due to

(A) the Formation of hydrogen bonds between alcohol and water molecules

(B) the Hydrophobic nature of alcohol

(C) the Increases in boiling points

(D) None of these

Option a – the Formation of hydrogen bonds between alcohol and water molecules

Conversion of CH3OH to CH3COOH can suitably be carried out with the reagent (under high-pressure conditions) :

(A) CO2/H2SO4

(B) CO/BF3

(C) CO2/BF3

(D) CO/H2SO4

Option b – CO/BF3

From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous is

(A) 1-Butanol

(B) 2-Butanol

(C) 2-Methylpropan-2-ol

(D) 2-Methylpropanol

Option c – 2-Methylpropan-2-ol

Primary amines can be converted into alkanols by reaction with

(A) Aqueous HCI

(B) Tilden’s reagent

(C) NaNO2 & dil. HCI

(D) Hypochlorous acid

Option c – NaNO2 & dil. HCl

Ethyl alcohol is made unfit for drinking by the addition of the following.

(A) Potassium Cyanide

(B) Methanol and Pyridine

(C) Acetic acid and Pyridine

(D) Naphthalene

Option b – Methanol and Pyridine

The offending substance in the liquor tragedies leading to blindness etc. is

(A) Ethyl alcohol

(B) Amyl alcohol

(C) Benzyl alcohol

(D) Methyl alcohol

Option d – Methyl alcohol

To whom is molasses are excellent raw material for production?

(A) Glycerin

(B) Urea

(C) Alcohol

(D) Paraffin

Option c – Alcohol

Which one of the following is also known as ‘wood spirit’?

(A) Methyl alcohol

(B) Ethyl alcohol

(C) Ethylene glycol

(D) Glycerol

Option a – Methyl alcohol

Fermentation of sugar leads to

(A) Ethyl alcohol

(B) Methyl alcohol

(C) Acetic acid

(D) Chlorophyll

Option a – Ethyl alcohol

Which of the following alcohols does not give a red color in the Victor Meyer test

(A) Isobutyl alcohol

(B) Isoamyl alcohol

(C) Diethyl carbinol

(D) Phenylcarbinol

Option c – Diethyl carbinol

Methanol and ethanol are distinguished by

(A) Treating with Schiff’s reagent

(B) Treating with Lucas reagent

(C) Heating with iodine and alkali

(D) Treating with CrO3 in dil. H₂SO4

Option c – Heating with iodine and alkali

The presence of -OH on adjacent carbon atoms can be detected by the reaction of the compound with

(A) Conc. H₂SO4

(B) Conc. HNO3

(C) HIO4

(D) Acidic KMnO4

Option a – Conc. H₂SO4

The reactivities of alcohol CH3OH, 1°, 2°, 3° towards metals follow the order :

(A) CH3OH > 1° > 2º > 3°

(B) 1° > 2°> 3° > CH3OH

(C) CH3OH > 3⁰° > 2° > 1°

(D) CH3OH > 2° > 3° > 1°

Option a – CH3OH > 1° > 2º > 3°

Which of the following is not expected to give ether on reaction with sodium methoxide

(A) CH3CH2CH2Cl

(B) CH2 = CHCH2Cl

(C) PhCH₂Cl

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(D) CH₂ = CHCI

Option d – CH₂ = CHCl

The order of reactivity of the following alcohols with a given halogen acid, say HBr, is

(A) CH3CH₂CHOHCH3 > CH3CH₂CH₂CH₂OH > (CH3)3COH

(B) (CH3)3COH > CH3CH2CHOHCH3 > CH3CH2CH2CH2OH

(C) CH3CH2CH2CH2OH > CH3CH₂CHOHCH3> (CH3)3COH

(D) (CH3)3COH > CH3CH2CH2CH₂OH > CH3CH₂CHOHCH3

Option b – (CH3)3COH > CH3CH2CHOHCH3 > CH3CH2CH2CH2OH

Tertiary alcohols are resistant to oxidation because

(A) They do not have a hydrogen atom

(B) Of large +1 effect of alkyl groups

(C) Of greater steric hindrance

(D) All the above

Option b – Of large +1 effect of alkyl groups

Ethanol on heating with acetic acid in the presence of a few drops of sulphuric acid gives the smell of :

(A) Oil of wintergreen

(B) Oil of mustard

(C) An ester

(D) Oil of bitter almonds

Option c – An ester

A compound X with the molecular formula C3H8O can be oxidized to a compound Y with the molecular formula C3H6O2, X is most likely to be

(A) Primary alcohol

(B) Secondary alcohol

(C) Aldehyde

(D) Ketone

Option a – Primary alcohol

A compound is soluble in concentrated H₂SO4. It does not decolorize bromine in carbon tetrachloride but is oxidized by chromic anhydride in aq. sulphuric acid within two seconds, turning the orange solution to blue-green and then opaque. The original compound is

(A) A primary alcohol

(B) A tertiary alcohol

(C) An alkene

(D) An ether

Option a – A primary alcohol

The reaction of alcohol does not show cleavage of the R-O linkage

(A) ROH + PCl5

(B) ROH + SOCI2

(C) ROH + HCI

(D) ROH + Na

Option d – ROH + Na

Replacement of the -OH group in alcohol by -Cl cannot be carried out with

(A) PCl5

(B) SO2Cl2

(C) PCl3

(D) SOCI2

Option b – SO2Cl2

Which alcohol does not give a ketone on oxidation

(A) Isopropyl alcohol

(B) Allyl alcohol

(C) Ethylmethylcarbinol

(D) Methylphenylcarbinol

Option b – Allyl alcohol

To prepare 3-ethylpentan-3-ol, the reactants needed are

(A) CH3CH2MgBr + CH3COCH2CH3

(B) CH3MgBr + CH3CH2CH2COCH2CH3

(C) CH3CH2MgBr + CH3CH2COCH2CH3

(D) CH3CH2CH2MgBr + CH3COCH2CH3

Option c – CH3CH2MgBr + CH3CH2COCH2CH3

Action of HNO2 on CH3NH2 gives

(A) CH3OH

(B) CH3-O-CH3

(C) CH3-O-N = O

(D) B and C both

Option d – B and C both

Propene is allowed to react with HBr in the presence of benzoyl peroxide and the product is subsequently heated with aqueous KOH. The final product obtained is

(A) 2-propanol

(B) 1,2-propanediol

(C) 1-propanol

(D) 1,3-propanediol

Option c – 1-propanol

Which of the following sets of reactants may be used to prepare 2-Methyl-2-butanol, C2H5C(OH)(CH3)2?

(A) 2-Butanone and methylmagnesium iodide

(B) Propanone and ethyl magnesium iodide

(C) Either of the above two

(D) Propanal and isopropyl magnesium bromide

Option c – Either of the above two

Isopropylamine is allowed to react with NaNO2 and dilute H₂SO4 at a temperature ranging from 0°C to 5°C. The expected product is

(A) 2-propanol

(B) 2-propanone

(C) 1-propanol

(D) 2-nitropropane

Option a – 2-propanol

LiAlH4 converts acetic acid into

(A) Acetaldehyde

(B) Methane

(C) Ethyl alcohol

(D) Methyl alcohol

Option c – Ethyl alcohol

For which of the following parameters the I structural isomers C2H5OH and CH3OCH3 would be expected to have the same values? (Assume ideal behavior)

(A) Heat of vaporization

(B) Vapour pressure at the same temperature

(C) Boiling points

(D) Gaseous densities at the same temperature and pressure

Option d – Gaseous densities at the same temperature and pressure

When CH2=CH-COOH is reduced with LiAlH4, the compound obtained will be

(A) CH3-CH2-CH2OH

(B) CH3-CH2-CHO

(C) CH3-CH2-COOH

(D) CH2=CH-CH₂OH

Option d – CH2=CH-CH₂OH

The hydroboration of 2-methyl propene yields

(A) 1° alcohol

(B) 2° alcohol

(C) 3° alcohol

(D) None

Option a – 1° alcohol

Alkyl chloride is formed when alcohol is treated in the presence of anhydrous ZnCl2. The HCl in reactivity with respect to alcohol is: in order of

(A) 3° >2°> 1°

(B) 1° >2°> 3°

(C) 2°> 1° > 3⁰

(D) 1° > 3° > 2⁰

Option a – 3° >2°> 1°

The action of nitrous acid on ethyl amine gives

(A) C2H6

(B) C₂H5OH

(C) NH3

(D) Nitromethane

Option b – C₂H5OH

At low temperatures, phenol reacts with Br₂ in CS₂ to form …….. as a minor product.

(A) p-bromophenol

(B) o-bromophenol

(C) 2,4-dibromophenol

(D) 2,4,6-tribromophenol

Option b – o-bromophenol

………. is formed when acetone is treated with sodium amalgam and water.

(A) Ethanol

(B) Propan-2-ol

(C) Butan-2-ol

(D) Propan-1-ol

Option b – Propan-2-ol

Which of the following has at least one OH group? (I) Salicylic acid (II) Anisole (III) Adipic acid (IV) Lactic acid (V) Vanillin (VI) Glyceraldehyde

(A) (II) and (V)

(B) (I), (IV), (V), and (VI)

(C) (I) and (IV)

(D) (I), (III), (V), and (VI)

Option b – (I), (IV), (V), and (VI)

The major product of acid-catalyzed dehydration of 1-methyl cyclohexanol is ………

(A) Cyclohexene

(B) 3-Methylcyclohexene

(C) 2-Methylcyclohexene

(D) 1-Methylcyclohexene

Option d – 1-Methylcyclohexene

What is the possible number of structural isomers of aliphatic monohydroxy alcohol consisting of a total of five carbon atoms including only one methyl group as a branch?

(A) 2

(B) 3

(C) 4

(D) 5

Option c – 4

In the mechanism of hydration of an alkene acid, the I presence of sulphuric electrophile involved is …….

(A) H₂O

(B) H3O

(C) SO3

(D) OH

Option b – H3O

Phenol in presence of sodium hydroxide reacts with chloroform to form salicylaldehyde. The reaction is known as ………

(A) Kolbe’s reaction

(B) Reimer-Tiemann reaction

(C) Stephen’s reaction

(D) Williamson synthesis

Option b – Reimer-Tiemann reaction

Identify the ether among the following that yields ethanol as one of the products of reaction with cold hydroiodic acid.

(A) Methoxyethane

(B) 1-Ethoxy-2-methylpropane

(C) 2-Ethoxy-2-methylpropane

(D) Ethoxybenzene

Option c – 2-Ethoxy-2-methylpropane

The intermolecular dehydration of ethanol at 413 K is an example of ……… reaction.

(A) addition

(B) elimination

(C) rearrangement

(D) substitution

Option d – substitution

Identify the CORRECT statement regarding 1-phenyl ethanol.

(A) It is vinylic alcohol.

(B) It is a phenol.

(C) It is benzylic alcohol.

(D) It is allylic alcohol.

Option c – It is benzylic alcohol.

The most suitable reagent for the following conversion is ……… Acetic acid → Ethanol

(A) H₂/Raney nickel

(B) NaBH4

(C) LiAlH4/ether, H₂O

(D) P₂05/heat

Option c – LiAlH4/ether, H₂O

Which of the following is the least acidic? (I) p-Bromophenol (II) p-Methoxyphenol (III) p-Cresol (IV) p-Hydroxybenzoic acid

(A) (I)

(B) (II)

(C) (III)

(D) (IV)

Option b – (II)

How many sigma bonds are present in m-cresol?

(A) 8

(B) 12

(C) 15

(D) 16

Option d – 16

Sorbitol has ………

(A) four primaries and two secondary -OH groups

(B) four secondary and two primary -OH groups

(C) six primary -OH groups

(D) six secondary -OH groups

Option b – four secondary and two primary -OH groups

Which of the following is CORRECT regarding Kolbe’s reaction?

(A) The first step of the reaction involves the conversion of phenol to phenoxide ion.

(B) In the second step of the reaction, the phenoxide ion undergoes aromatic nucleophilic substitution with CO₂.

(C) At lower temperatures, 4-hydroxybenzoic acid is the major product.

(D) At higher temperatures, 2-hydroxybenzoic acid is the major product.

Option a – The first step of the reaction involves the conversion of phenol to phenoxide ion.

Propanal on hydrogenation in presence of Pt forms (X). In the presence of HBF4, (X) reacts with diazomethane to give …….

(A) methoxymethane

(B) methoxy ethane

(C) 1-methoxypropane

(D) 2-methoxypropane

Option c – 1-methoxypropane

An organic compound on treatment with conc sulphuric acid gives an intermediate compound which on further hydrolysis gives, isopropanol. The organic compound is …….. and the process is called ……….

(A) CH3CH₂CH₂OH; elimination

(B) CH3CH₂CH3; dehydration

(C) CH3CH=CH2; substitution

(D) CH₂=CHCH3; hydration

Option d – CH₂=CHCH3; hydration

Chlorobenzene is heated with steam at 698 K using Ca3(PO4)2 as a catalyst to form compound (A When compound (A) is heated with zinc dust compound (B) is obtained. Identify the CORRECT statement about compound (B).

(A) Compound (B) is a diketone.

(B) Compound (B) is a haloarene.

(C) Compound (B) is an aldehyde.

(D) Compound (B) is an aromatic hydrocarbon

Option d – Compound (B) is an aromatic hydrocarbon

Catalytic hydrogenation of butanal yield ………

(A) n-butane

(B) pentan-2-ol

(C) butan-1-ol

(D) butanoic acid

Option c – butan-1-ol

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