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Free download in PDF Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Multiple Choice Questions (MCQs) and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(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
(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
(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
(5)
Phenol is less acidic than
[A]
acetic acid
[B]
p-methoxyphenol
[C]
p-nitrophenol
[D]
Ethanol
(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
(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
(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
(17)
Order of esterification of alcohols are
[A]
3° > 1° > 2°
[B]
2°> 3° > 1°
[C]
1 ° > 2° > 3°
[D]
None of these
(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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