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Free download in PDF Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Objective Type Questions 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)
Acid catalysed dehydration of t-butanol is faster than that of n-butanol because
[A]
tertiary carbocation is more stable than primary carbocation
[B]
primary carbocation is more stable than tertiary carbocation
[C]
t-butanol has a higher boiling point
[D]
rearrangement takes place during dehydration of t- butanol
Answer: tertiary carbocation is more stable than primary carbocation
(2)
An unknown alcohol is treated with “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism?
[A]
Tertiary alcohol by SN2
[B]
Secondary alcohol by SN1
[C]
Tertiary alcohol by SN1
[D]
Secondary alcohol by SN2
Answer: Tertiary alcohol by SN1
(3)
An alcohol X when treated with hot cone. H2SO4 gave an alkene Y with formula C4H8. This alkene on ozonolysis gives single product with molecular formula C2H4O. The alcohol is
[A]
butan-1-ol
[B]
butan-2-ol
[C]
2-methylpropan-1-ol
[D]
2,2-dimethylbutynal-1-oI
(4)
Propanone on reaction with alkyl magnesium bromide followed by hydrolysis will produce
[A]
primary alcohol
[B]
secondary alcohol
[C]
tertiary alcohol
[D]
carboxylic acid
(5)
Vapours of an alcohol X when passed over hot reduced copper, produce an alkene, the alcohol is
[A]
primary alcohol
[B]
secondary alcohol
[C]
tertiary alcohol
[D]
dihydric alcohol
(6)
Phenol when treated with excess of bromine water gives a white precipitate of
[A]
2, 4, 6-tribromophenol
[B]
o-bromophenol
[C]
p-bromophenol
[D]
bromobenzene
Answer: 2, 4, 6-tribromophenol
(7)
Picricacid is a yellow coloured compound. Its chemical name is
[A]
m-nitrobenzoic acid
[B]
2, 4, 6-trinitropheriol
[C]
2, 4, 6-tribromophenol
[D]
p-nitrophenol
Answer: 2, 4, 6-trinitropheriol
(8)
Ortho-nitrophenol is less soluble in water than, p- and m- nitrophenols because
[A]
o-nitrophenol shows intramolecular H-bonding
[B]
o-nitrophenol shows intermolecular H-bonding
[C]
melting point of o-nitrophenol is lower than those of m- and p-isomers
[D]
o-nitrophenol is more volatile in steam than those of m- and p-isomers
Answer: o-nitrophenol shows intramolecular H-bonding
(9)
The best reagent to convert pent-3-en-2-ol into pent-3-en- 2-one is
[A]
acidic permanganate
[B]
acidic dichromate
[C]
chromic anhydride in glacial acetic acid
[D]
pyridiriium chlorochromate
Answer: pyridiriium chlorochromate
(10)
Arrange the following alcohols in order of increasing reactivity towards sodium metal.
(i) (CH3)3C-OH
(ii) (CH3)2CH-OH
(iii) CH3CH2OH
[A]
(iii) < (ii) < (i)
[B]
(ii) > (i) < (iii)
[C]
(i) < (ii) < (iii)
[D]
(iii) < (i) < (ii)
Answer: (i) < (ii) < (iii)
(11)
The reaction between phenol and chloroform in the presence of aqueous NaOH is
[A]
nucleophilic substitution reaction
[B]
electrophilic addition reaction
[C]
electrophilic substitution reaction
[D]
nucleophilic addition reaction
Answer: electrophilic substitution reaction
(12)
he most suitable reagent for the conversion of RCH2OH → RCHO is
[A]
K2Cr2O7
[B]
CrO3
[C]
KMnO4
[D]
PCC
(13)
The major product of acid catalysed dehydration of 2-methylcyclohexanol and butan-1-ol are respectively
[A]
1 -methylcyclohexene andbut-1-ene
[B]
2-methylcyclohexene and but-2-ene
[C]
2-methylcyclohexene and butane
[D]
1-methylcyclohexene and but-2-ene
Answer: 1 -methylcyclohexene andbut-1-ene
(14)
Tertiary butyl alcohol gives tertiary butyl chlorideon treatment with
[A]
Conc HCl/anhydrous ZnCl3
[B]
KCN
[C]
NaOCl
[D]
Cl2
Answer: Conc HCl/anhydrous ZnCl3
(15)
Which of the following alcohol is dehydrated most easily with cone. H2SO4?
[A]
p-O2NC6H4CH(OH)CH3
[B]
p-ClC6H4CH(OH)CH3
[C]
p-CH3OC6H4CH(OH)CH3
[D]
p-CH3OC6H4CH(OH)CH3
Answer: p-CH3OC6H4CH(OH)CH3
(16)
Conversion of phenol to salicyclic acid and to salicyaldehyde are known as (respectively)
[A]
Reimer-Tiemann reaction and Kolbe’s reaction
[B]
Williamson’s synthesis and Hydrobration-oxidation
[C]
Kolbe’s reaction and Williamson’s synthesis
[D]
Kolbe’s reaction and Reimer-Tiemann reaction
Answer: Kolbe’s reaction and Reimer-Tiemann reaction
(17)
Which of the following is phenol?
[A]
Cresol
[B]
Catechol
[C]
Benzenol
[D]
All of these
(18)
Benzoquinone is prepared by reaction of phenol with
[A]
Na2Cr2O7, H2SO4
[B]
KMnO4, H2SO4
[C]
Na2CrO4,HCl
[D]
K2MnO4, H2SO4
(19)
The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is
[A]
benzoic acid
[B]
salicyaldehyde
[C]
salicylic acid
[D]
phthalic acid
(20)
Which of the following compounds will give tribromo derivative on treatment with bromine water?
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