Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Multiple Choice Questions (MCQs) and Answers | Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Quiz

Questions

1 The compound obtained by the reaction of ethene with diborane followed by hydrolysis with alkaline H₂O₂ is

A ethanol

B propanol

C ethanol

D triethyl bromide

View Answer

Answer:ethanol

2 Which of the following is formed when phenol is exposed to air?

A o-Benzoquinone

B p-Benzoquinone

C Phenoquinone

D o-and p-Benzoquinone

View Answer

Answer:add 0.01 mol NaCl

3 Which of the following is formed when glycerol is heated with oxalic acid at 503K?

A Glyceric acid

B Acrolein

C Allyl alcohol

D Methanoic acid

View Answer

Answer: Allyl alcohol

4 The alcohol which does not react with Lucas reagent is

A isobutyl alcohol

B n-butanol

C tert-butyl alcohol

D sec-butyl alcohol

View Answer

Answer: n-butanol

5 Phenol is less acidic than

A acetic acid

B p-methoxyphenol

C p-nitrophenol

D Ethanol

View Answer

Answer: acetic acid

6 Benzenediazonium chloride on reaction with phenol in weakly basic medium gives

A Diphenyl ether

B p-hydroxyazobenzene

C Chlorobenzene

D Benzene

View Answer

Answer:p-hydroxyazobenzene

7 Phenol reacts with bromine in CS2 at low temperature to give

A m-bromophenol

B o-and p-bromophenol

C p-bromophenol

D 2,4,6-tribromophenol

View Answer

Answer:o-and p-bromophenol

8 When phenol is treated with excess bromine water it gives

A m-bromophenol

B o- and p-bromophenol

C 2,4-dibromophenol

D 2,4,6-tribromophenol

View Answer

Answer:2,4,6-tribromophenol

9 Phenol on reduction with H2 in the presence of Ni catalyst gives

A Benzene

B Toluene

C Cyclohexane

D Cyclohexanol

View Answer

Answer:Cyclohexanol

10 Dehydration of alcohol is an example of

A addition reaction

B elimination reaction

C substitution reaction

D redox reaction

View Answer

Answer:elimination reaction

11 Which of the following alcohols gives 2-butenc on dehydration byconc. H2SO4?

A 2-methyl propene-2-ol

B 2-methyl 1 -propanol

C Butane-2-ol

D Butane 1-ol

View Answer

Answer:Butane-2-ol

12 One mole of ethyl acetate on tatment with an excess of LiAlH₄ in dry ether and subsequent acidification produces

A 1 mole acetic acid + 1 mole ethyl alcohol

B 1 mole ethyl alcohol + 1 mole methyl alcohol

C 2 moles of ethyl alcohol

D 1 mole of 2-butanol

View Answer

Answer: 2 moles of ethyl alcohol

13 Which of the following reagents can not, be used to oxidise primary alcohols to aldehydes?

A CrO₃ in anhydrous medium

B KMnO₄ in acidic medium

C Pyridinium chlorochromate

D Heat in the presence of Cu at 573 K

View Answer

Answer: KMnO₄ in acidic medium

14 1-Phenylethanol can be prepared by the reaction of benzaldehyde with

A methyl bromide

B ethyl iodide and magnesium

C methyl iodide and magnesium (Grignard reagent’s)

D methyl bromide and aluminium bromide

View Answer

Answer: methyl iodide and magnesium (Grignard reagent’s)

15 Which of the following alcohols will give the most stable carbocation during dehydration?

A 2-methyl-1-propanol

B 2-methyl-2-propanol

C 1-Butanol

D 2-Butanol

View Answer

Answer:2-methyl-2-propanol

16 A compound X with the molecular formula C₂H₈O can be oxidised to another compound Y whose molecular formulae is C₃H₆O₂. The compound X may be

A CH₃CH₂OCH₃

B CH₃CH₂CHO

C CH₃CH₂CH₂OH

D CH₃CHOHCH₃

View Answer

Answer: CH₃CH₂CH₂OH

17 Order of esterification of alcohols are

A 3° > 1° > 2°

B 2°> 3° > 1°

C 1 ° > 2° > 3°

D None of these

View Answer

Answer: 1 ° > 2° > 3°

18 What happens when tertiary butyl alcohol is passed over heated copper at 300°C?

A Secondary butyl alcohol is formed

B 2-methylpropene is formed

C 1-butene is formed

D Butanol is formed

View Answer

Answer:2-methylpropene is formed

19 What would be the reactant and reagent used to obtain 2, 4-dimenthyl pentan-3-ol?

A Propanal and propyl magnesium bromide

B 3-methylbutanal and 2-methyl magnesium iodide

C 2-dimethylpropanone and methyl magnesium odide

D 2-methylpropanal and isopropyl magnesium iodide

View Answer

Answer: 2-methylpropanal and isopropyl magnesium iodide

20 The decreasing order of boiling point of the following alcohols is

A 3-methylbuan-2-ol > 2-methylbutan-2-ol > pentan-1-ol

B Pentan-1-ol > 3-methylbutan-2-ol > 2-methylbutan-2-ol

C 2-methylbutan-2-ol > 3-methylbutan-2-ol > pentan-1-ol

D 2-methylbutan-2-ol > pental-1-ol > 3-methylbutan-2-ol

View Answer

Answer: Pentan-1-ol > 3-methylbutan-2-ol > 2-methylbutan-2-ol

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