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(III)
The correct order of rate of dehydration is:
Alcohol reacts faster with Lucas reagent. Hence and are
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JEE • CHEMISTRY • ALCOHOLS & PHENOLS & ETHERS
Alcohols & phenols & ethers practice · Mixed difficulty
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91
Easy
91 of 193
Remembering
+4 | -1
The reaction given below is called:
View answer and explanation
Correct option: C
Darzen’s reaction
Option C (Darzen’s reaction) is correct because the reaction of an alcohol with SOCl2 to form an alkyl chloride, SO2, and HCl is known as Darzen's reaction.
92
Easy
92 of 193
Remembering
+4 | -1
Williamson’s synthesis is used for the preparation of
View answer and explanation
Correct option: C
Ether
Option C is correct because Williamson's synthesis is a method used for the preparation of ethers by reacting an alkyl halide with an alkoxide.
93
Easy
93 of 193
Understanding
+4 | -1
For one mole of glycerol, how many mole of acetyl chloride are required for complete acetylation?
View answer and explanation
Correct option: C
Three
Option C (Three) is correct because glycerol has three hydroxyl (-OH) groups, and each -OH group requires one mole of acetyl chloride for complete acetylation.
94
Easy
94 of 193
Remembering
+4 | -1
Which of the following reaction conditions are used for the conversion of ethanol to ethylene?
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Correct option: D
conc.
Option D ( conc. ) is correct because ethanol is converted to ethylene by dehydration using concentrated sulfuric acid at 170°C.
95
Medium
95 of 193
Analyzing
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A compound with molecular formula can be oxidised to a compound with the molecular formula . is most likely to be:
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Correct option: A
Primary alcohol
Option A (Primary alcohol) is correct because primary alcohols can be oxidized to carboxylic acids with the given molecular formula change.
96
Easy
96 of 193
Application
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The number of isomeric alcohols of formula is:
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Correct option: B
4
Option B (4) is correct because there are four structural isomers of alcohols with the formula C4H10O: butan-1-ol, butan-2-ol, 2-methylpropan-1-ol, and 2-methylpropan-2-ol.
97
Medium
97 of 193
Analyzing
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A compound with molecular formula is converted by the action of acetyl chloride to a compound with molecular weight 190. The original compound has:
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Correct option: B
Two groups
Option B is correct because the original compound has two OH groups, which react with acetyl chloride to increase the molecular weight by 84 (2 * 42), resulting in a final molecular weight of 190.
98
Easy
98 of 193
Remembering
+4 | -1
What is the composition of methylated spirit?
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Correct option: A
Methanol + ethanol
Option A (Methanol + ethanol) is correct because methylated spirit is ethanol with added methanol to make it unfit for drinking.
99
Easy
99 of 193
Analyzing
+4 | -1
Phenol can be distinguished from ethanol by the following reagents except
View answer and explanation
Correct option: A
Sodium
Option A is correct because both phenol and ethanol react with sodium to produce hydrogen gas, so sodium cannot be used to distinguish between them.
100
Easy
100 of 193
Analyzing
+4 | -1
(III)
The correct order of rate of dehydration is:
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Correct option: A
(I) (II) (III)
Option A ((I) (II) (III)) is correct because the rate of dehydration depends on the stability of the carbocation formed, and tertiary carbocations are more stable than secondary, which are more stable than primary.
101
Medium
101 of 193
Understanding
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The compound formed when Ethyl bromide is heated with dry Silver oxide is
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Correct option: B
diethylether
Option B is correct because when ethyl bromide is heated with dry silver oxide, it undergoes a Williamson ether synthesis to form diethyl ether.
102
Easy
102 of 193
Remembering
+4 | -1
Williamson’s synthesis is used to prepare
View answer and explanation
Correct option: A
Diethyl ether
Option A (Diethyl ether) is correct because Williamson's synthesis is a method for preparing ethers by reacting an alkoxide with a haloalkane.
103
Hard
103 of 193
Application
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To prepare 3-ethylpentane-3-ol, the reactants needed are:
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Correct option: C
The correct answer is C () because the Grignard reagent reacts with the ketone to form the desired tertiary alcohol after hydrolysis.
104
Medium
104 of 193
Analyzing
+4 | -1
and can be distinguished by
View answer and explanation
Correct option: D
Both (2) and (3 )
Option D (Both (2) and (3)) is correct because phenol reacts with to give a color and ethanol gives iodoform test with .
105
Medium
105 of 193
Analyzing
+4 | -1
Which of the following alcohols is dehydrated most readily with conc.
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Correct option: C
Option C () is correct because the electron-donating methoxy group stabilizes the carbocation intermediate formed during dehydration, accelerating the reaction.
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106
Medium
106 of 193
Analyzing
+4 | -1
Addition of Grignard reagent to acetaldehyde followed by hydrolysis and then acidic dehydration of the resulting product gives
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Correct option: B
Alkene
Option B (Alkene) is correct because the Grignard addition to acetaldehyde followed by hydrolysis yields a secondary alcohol, which dehydrates to form an alkene.
107
Easy
107 of 193
Remembering
+4 | -1
In order to make alcohol undrinkable pyridine and methanol are added to it. The resulting alcohol is called
View answer and explanation
Correct option: C
Denatured spirit
Option C (Denatured spirit) is correct because denatured spirit is alcohol made undrinkable by adding substances like pyridine and methanol.
108
Hard
108 of 193
Remembering
+4 | -1
Which of the following are known as mercaptans?
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Correct option: A
Thio-alcohols
Option A (Thio-alcohols) is correct because mercaptans are also known as thio-alcohols and have the general formula R-SH.
109
Medium
109 of 193
Understanding
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To obtain unsaturated alcohols from unsaturated aldehydes the following reagent is used for reduction:
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Correct option: D
Option D is correct. LiAlH4 reduces the carbonyl group of an aldehyde to an alcohol without affecting the carbon-carbon double bond.
110
Easy
110 of 193
Remembering
+4 | -1
Phenol is:
View answer and explanation
Correct option: B
Weakly acidic
Option B (Weakly acidic) is correct because phenol can donate a proton but is not a strong acid.
111
Easy
111 of 193
Remembering
+4 | -1
An enzyme which brings about the conversion of starch into maltose is known as:
View answer and explanation
Correct option: D
Diastase
Option D (Diastase) is correct because diastase is the enzyme responsible for breaking down starch into maltose.
112
Easy
112 of 193
Understanding
+4 | -1
For benzaldehyde which of the following is incorrect?
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Correct option: D
On reduction it yields phenol
Option D (On reduction it yields phenol) is correct because the reduction of benzaldehyde yields benzyl alcohol, not phenol.
113
Hard
113 of 193
Analyzing
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Assertion: Tertiary alcohols gets converted into an alkene instead of a carbonyl Compounds in the presence of heated metallic copper.
Reason: Tertiary alcohols prefer to undergo dehydrogenation instead of dehydration in the presence of heated copper.
Reason: Tertiary alcohols prefer to undergo dehydrogenation instead of dehydration in the presence of heated copper.
View answer and explanation
Correct option: C
Assertion is correct, but reason is wrong statement.
The correct answer is C (Assertion is correct, but reason is wrong statement) because tertiary alcohols undergo dehydration to form alkenes in the presence of heated copper, not dehydrogenation.
114
Medium
114 of 193
Analyzing
+4 | -1
Arrange the compounds in order of decreasing acidity:
I.
II.
III.
IV.
I.
II.
III.
IV.
View answer and explanation
Correct option: D
II I III IV
Option D (II > I > III > IV) is correct because electron-withdrawing chlorine atoms increase acidity, and thiols are more acidic than alcohols.
115
Medium
115 of 193
Analyzing
+4 | -1
Alcohol reacts faster with Lucas reagent. Hence and are
View answer and explanation
Correct option: A
Option A is correct because the ester reacts with excess Grignard reagent to form the tertiary alcohol , which reacts fastest with Lucas reagent.
116
Easy
116 of 193
Remembering
+4 | -1
Which of the following is used as antiseptic?
View answer and explanation
Correct option: C
Both (1) and (2)
Option C (Both (1) and (2)) is correct because both ethanol (C2H5OH) and iodoform are used as antiseptics.
117
Medium
117 of 193
Understanding
+4 | -1
Dehydration of 2-butanol yields
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Correct option: D
Both (1) and (2)
Option D (Both (1) and (2)) is correct because dehydration of 2-butanol yields both 1-butene and 2-butene as products, with 2-butene being the major product due to Zaitsev's rule.
118
Hard
118 of 193
Understanding
+4 | -1
is a functional isomer of
View answer and explanation
Correct option: A
Option A () is correct because it is an ether with the same molecular formula as the given alcohol, making them functional isomers.
119
Medium
119 of 193
Application
+4 | -1
For the preparation ter-butylmethylether by Williamson’s method the correct choice of reagents is:
View answer and explanation
Correct option: D
Ter-butoxide and methylbromide
The correct answer is D (Ter-butoxide and methylbromide) because tertiary halides are not suitable for Williamson's synthesis due to elimination reactions.
120
Easy
120 of 193
Remembering
+4 | -1
Which is an excellent antiseptic?
View answer and explanation
Correct option: A
Phenol
Option A (Phenol) is correct because phenol is a well-known antiseptic and disinfectant, commonly used in carbolic soaps and other applications.
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Showing 91-120 of 193 questions
