Free Alcohols and Phenols MCQs with Answers

• A. n−Propyl bromide
• B. Isopropyl bromide
• C. 2−Bromo−2−methylpropane
• D. ter−Pentyl bromide

Explanation: The best-suited alkyl halide for the preparation of ether by Williamson's method would be 1° alkyl halides because the reaction is of…

• A. CH3MgBr + CH3COCH3
• B. CH3CH2MgBr + CH3COCH3
• C. CH3MgBr + CHCH(OH)CH3
• D. CH3MgBr + (CH3)3CH

Explanation: Tertiary alcohols are prepared by the reaction of a Grignard reagent with a ketone followed by acid hydrolysis.

• A. Methanol
• B. Acetone
• C. Pyridine
• D. All of these

Explanation: Denatured alcohol is poisonous to user. Methanol, acetone and pyridine all can be added to make it poisonous.

• A. Aldehydes
• B. Ketones
• C. Alkenes
• D. Alkynes

Explanation: Teritary alcohols do not undergo oxidation instead they undergo β -elimination to give alkenes.

• A. 1-Propanol
• B. Ethanol
• C. Methanol
• D. 2-Methyl-2-propanol

Explanation: The iodoform test is a chemical test used to detect the presence of a methyl ketone or a secondary alcohol in a given substance.

• A. Organic acid
• B. Inorganic acid
• C. Both organic and inorganic acids
• D. Ethers

Explanation: Esterification can occur when an alcohol reacts with an organic acid, and this includes carboxylic acids.

• A. Alcohol
• B. Acid
• C. Alcohol or acid
• D. Catalyst

Explanation: In the context of ester formation, the term "bridge oxygen" might be referring to the oxygen atom that bridges between the alcohol and the…

• A. 1°> 2° >3°
• B. 3° >2° >1°
• C. 2° >1° >3°
• D. Both B and C are correct

Explanation: The reactivity of alcohols with phosphorus pentachloride (PX5, where X is a halogen, usually chlorine) is influenced by the structure of…

• A. C- O bond breaks
• B. C-C bond breaks
• C. O-H bond breaks
• D. C- H bond breaks

Explanation: 2C2H5OH +2Na → C2H5ONa + H2 It is replaced by Na+ by breaking the O-H bond

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: Diols have 2 replaceable hydrogen. The stoichiometry often involves a 1:1 ratio for the diol to hydrogen gas.

• A. Addition
• B. Evaporation
• C. Elimination
• D. Esterification

Explanation: Esters give off particular flavours. lsobutyl formate - Raspberry flavour. Iso-Butyl alcohol + Formic acid → lsobutyl formate.

• A. Alkyl alkanote
• B. Alkane alkanoic acid
• C. Aloxy alkanote
• D. Alkyl aloxy alkane

Explanation: Functional group isomer of alkoxy alkanes (ethers) is alkanol (alcohol) which reacts with alkonic acids (carboxylic acids) to give esters…

• A. Ether
• B. Organic acid
• C. Ester
• D. Alkene

Explanation: Low temperature favours formation of ethers by dehydration of alcohols, while high temprature favours β-elimination to form alkenes.

• A. Halogenation
• B. Nitration
• C. Oxidation
• D. Sulphonation

Explanation: Picric acid (2,4,6-trinitrophenol) can be prepared from phenol through a nitration reaction.

• A. C6H5OH + CH3COCI in the presence of aq. NaOH
• B. C6H5OH + HCHO in the presence of NaOH
• C. C6H5ONa++ CH3CH2 Br
• D. C6H5OH + Br2 (excess)

Explanation: Phenol can be tested by bromine water test, as it gives white ppt of 2,4,6 Tribromophenol.

• A. Tollen's reagent
• B. Br2(aq)
• C. NaHCO3
• D. HCI

Explanation: Both alcohols and phenol do not give Tollen's test, NaHCO3 test and reaction with HCl.

• A. lodoform test
• B. Na-metal
• C. Aq. Br2
• D. Lucas-reagent

Explanation: Phenol reacts with NaOH, gives Bromine water test but alcohol doesn't give Bromine water test and doesn't react with NaOH as pKa of…

• A. Nitration .
• B. Esterification
• C. Sulphonation
• D. Bromination

Explanation: Esterification is due to OH group and not the ring.

• A. Di methyl ether
• B. Methanol
• C. Acetic acid
• D. Ethanol

Explanation: Ethers do not react with Na , as they don't have an OH group to react.

• A. Ketone
• B. Carboxylic
• C. Alkyl halide
• D. Ester

Explanation: Zinc reacts rapidly with hydrochloric acid to form zinc chloride and hydrogen gas.