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In this reaction, identify the incorrect statement?
In the above reaction, compounds and are:
can be prepared from which of the following combinations?
A will be
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JEE • CHEMISTRY • ALCOHOLS & PHENOLS & ETHERS
Alcohols & phenols & ethers practice · Mixed difficulty
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121
Medium
121 of 193
Analyzing
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Assertion (A): of ethoxyethane and of butan-1-ol is miscible to almost same extent while pentane is essentially immiscible with water.
Reason (R): Alcohols and ethers can form hydrogen bonds with the water molecule.
Reason (R): Alcohols and ethers can form hydrogen bonds with the water molecule.
View answer and explanation
Correct option: A
Both and are correct; is the correct explanation of .
Option A (Both A and R are true and R is the correct explanation of A) is correct because the back bonding in makes it a weaker Lewis acid compared to .
122
Easy
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Remembering
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Saponification means hydrolysis of an ester with:
View answer and explanation
Correct option: D
Option D (NaOH) is correct because saponification is the hydrolysis of an ester using a strong base like NaOH to produce a soap (salt of a fatty acid) and alcohol.
123
Hard
123 of 193
Understanding
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Name the reagent used to convert bromoethane to ethoxy ethane
View answer and explanation
Correct option: A
Sodium ethoxide
Option A (Sodium ethoxide) is correct because bromoethane reacts with sodium ethoxide via Williamson ether synthesis to form ethoxyethane.
124
Medium
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Remembering
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Chlorex which is a good solvent for aromatic impurities is:
View answer and explanation
Correct option: B
Dichlorodiethyl ether
Option B (Dichlorodiethyl ether) is correct because Chlorex, a good solvent for aromatic impurities, is dichlorodiethyl ether.
125
Medium
125 of 193
Analyzing
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An alcohol on oxidation is found to give and The alcohol is:
View answer and explanation
Correct option: D
Option D () is correct because its oxidation leads to the formation of both acetic acid and propanoic acid via bond cleavage.
126
Medium
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Remembering
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Ethers on hydrolysis yield
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Correct option: A
Alcohol
Option A (Alcohol) is correct because ethers, upon hydrolysis, yield alcohols.
127
Medium
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Understanding
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The reaction of with gives:
View answer and explanation
Correct option: C
Option C () is correct because the reaction of an ether with HI cleaves the ether bond, with the smaller alkyl group typically forming the iodide and the larger forming the alcohol.
128
Medium
128 of 193
Analyzing
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For which of the following parameters the structural isomers and would be expected to have the same values? (Assume ideal behaviour)
View answer and explanation
Correct option: D
Gaseous densities at the same temperature and pressure
Option D (Gaseous densities at the same temperature and pressure) is correct because the ideal gas law relates density to molar mass, which is the same for both isomers.
129
Easy
129 of 193
Understanding
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Ethyl iodide on treatment with dry will yield:
View answer and explanation
Correct option: B
Diethyl ether
Option B (Diethyl ether) is correct because ethyl iodide reacts with dry to produce diethyl ether.
130
Easy
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Understanding
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Phenol is weakly acidic but does not react with like carboxylic acids hence:
View answer and explanation
Correct option: A
Phenol is weaker than carbonic acid
Option A (Phenol is weaker than carbonic acid) is correct because phenol does not react with sodium bicarbonate (), indicating it's a weaker acid than carbonic acid, which is formed when reacts with an acid.
131
Medium
131 of 193
Analyzing
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The most acidic compound among following is:
View answer and explanation
Correct option: D
Option D is correct because carboxylic acids are more acidic than other given compounds due to resonance stabilization of the carboxylate ion.
132
Medium
132 of 193
Analyzing
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In this reaction, identify the incorrect statement?
View answer and explanation
Correct option: D
is a paracetamol
Option D ( is a paracetamol) is correct because the final product is aspirin (O-acetoxybenzoic acid), not paracetamol.
133
Easy
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Understanding
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The reaction of Lucas reagent is fastest with
View answer and explanation
Correct option: D
Option D ((CH3)3COH) is correct because tertiary alcohols react fastest with Lucas reagent due to the formation of a stable tertiary carbocation.
134
Medium
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Remembering
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Lucas reagent is
View answer and explanation
Correct option: A
Conc. and anhydrous
Option A (Conc. and anhydrous ) is correct because Lucas reagent is a solution of concentrated hydrochloric acid and anhydrous zinc chloride.
135
Medium
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Remembering
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Phenol have ____ acidic strength than alcohols:
View answer and explanation
Correct option: B
Greater
The correct answer is B (Greater) because phenols are more acidic than alcohols due to the stabilization of the phenoxide ion by resonance.
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136
Medium
136 of 193
Application
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What is the product when reacts with nitrous acid?
View answer and explanation
Correct option: C
Option C () is correct because primary amines react with nitrous acid to form diazonium salts, which decompose to form alcohols.
137
Medium
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Understanding
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To distinguish between salicylic acid and phenol one can use
View answer and explanation
Correct option: A
solution
Option A ( solution) is correct because salicylic acid reacts with to produce effervescence, while phenol does not.
138
Easy
138 of 193
Application
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The product C in the following sequence of reaction,
is:
is:
View answer and explanation
Correct option: C
Methyl ethyl ether
Option C (Methyl ethyl ether) is correct because the sequence of reactions leads to the formation of an ether via Williamson ether synthesis.
139
Easy
139 of 193
Analyzing
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If the boiling point of ethanol (molecular weight=46) is 78, what is the boiling point of diethyl ether?
(molecular weight=74)
(molecular weight=74)
View answer and explanation
Correct option: D
34
Option D (34 ) is correct because diethyl ether lacks hydrogen bonding, resulting in a significantly lower boiling point compared to ethanol, despite having a higher molecular weight.
140
Easy
140 of 193
Remembering
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Proof spirit contains about:
View answer and explanation
Correct option: A
48% alcohol by weight
Option A (48% alcohol by weight) is correct because proof spirit contains approximately 48% alcohol by weight or 57.1% by volume.
141
Medium
141 of 193
Understanding
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In the above reaction, compounds and are:
View answer and explanation
Correct option: D
benzene and nitrobenzene
Option D (benzene and nitrobenzene) is correct because phenol on zinc distillation gives benzene, which on nitration with conc. and conc. at 60°C gives nitrobenzene.
142
Medium
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Remembering
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Purity of ether before using it as anaesthetic agent is tested by:
View answer and explanation
Correct option: A
starch
Option A is correct because the presence of peroxides in ether, which can form upon exposure to air, is detected using KI and starch, leading to the formation of iodine and a blue color.
143
Medium
143 of 193
Analyzing
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Which of the following can be used to distinguish between phenol and cyclohexanol
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Correct option: B
Option B () is correct because phenol reacts with NaOH to form a salt soluble in water, while cyclohexanol does not react.
144
Medium
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Analyzing
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For the molecule
total number of stereoisomers and meso form respectively are
total number of stereoisomers and meso form respectively are
View answer and explanation
Correct option: D
4,2
Option B (2-methylpentane) is correct because it has the most non-equivalent hydrogen atoms, leading to the maximum number of monochloro derivatives.
145
Medium
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Analyzing
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can be prepared from which of the following combinations?
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because Grignard reagents can react with aldehydes and ketones, and reduction of ketones can also yield the desired alcohol.
146
Easy
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Application
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The number of isomeric alcohols of formula is:
View answer and explanation
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.
147
Medium
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Understanding
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The alcohol which does not give a stable compound on dehydration is
View answer and explanation
Correct option: B
methyl alcohol
Option B (methyl alcohol) is correct because dehydration of methyl alcohol leads to the formation of unstable carbene.
148
Medium
148 of 193
Analyzing
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Which of the following sequence of reagent is the good means to furnish the conversion?
View answer and explanation
Correct option: B
Option B is correct because the sequence of reagents SOCl₂, NaCN, and H₂/Ni effectively converts the alcohol to an amine with two additional carbon atoms.
149
Easy
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Remembering
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Carbolic acid is
View answer and explanation
Correct option: D
Option D () is correct because carbolic acid is the common name for phenol, which has the formula .
150
Medium
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Application
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A will be
View answer and explanation
Correct option: A
Option A is correct because reduces the carboxylic acid group to an alcohol, while the ester group remains unaffected.
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Showing 121-150 of 193 questions
