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

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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

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

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

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

Answer: n-butanol
5 Phenol is less acidic than
A acetic acid
B p-methoxyphenol
C p-nitrophenol
D Ethanol

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

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

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

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

Answer:Cyclohexanol
10 Dehydration of alcohol is an example of
A addition reaction
B elimination reaction
C substitution reaction
D redox reaction

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

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

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

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

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

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

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

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

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

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

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

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