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JEE • CHEMISTRY • ALDEHYDES & KETONES & CARBOXYLIC ACIDS

Aldehydes & ketones & carboxylic acids practice · Medium

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 151-165 of 165 questions
151 Medium
151 of 165
Analyzing +4 | -1
CH3CHO\mathrm{CH}_3 \mathrm{CHO} and CH3COCH3\mathrm{CH}_3 \mathrm{COCH}_3 cannot be distinguished chemically by
View answer and explanation
Correct option: D
lodoform test
Option D (lodoform test) is correct because both CH3CHO\mathrm{CH}_3 \mathrm{CHO} and CH3COCH3\mathrm{CH}_3 \mathrm{COCH}_3 give a positive iodoform test, so it cannot be used to distinguish them.
152 Medium
152 of 165
Remembering +4 | -1
Alkaline hydrolysis of an ester is called:
View answer and explanation
Correct option: D
Saponification
Option D (Saponification) is correct because alkaline hydrolysis of an ester is called saponification, which produces soap and alcohol.
153 Medium
153 of 165
Understanding +4 | -1
Acetalsehyde reacts with:
View answer and explanation
Correct option: B
Both electrophiles and nucleophiles
Option B (Both electrophiles and nucleophiles) is correct because acetaldehyde has an electrophilic carbonyl carbon and can also undergo reactions involving the acidic alpha-hydrogens.
154 Medium
154 of 165
Understanding +4 | -1
Which of the following on oxidation gives an acid containing two carbon atoms?
View answer and explanation
Correct option: A
Ethanol
Option A (Ethanol) is correct because the oxidation of ethanol yields acetaldehyde, which further oxidizes to ethanoic acid (acetic acid), containing two carbon atoms.
155 Medium
155 of 165
Analyzing +4 | -1
Order of boiling points of following

I) n-Butane \quad II) Acetone \quad III) Propanal

IV) Methoxy ethane \quad V) Propan-1-ol
View answer and explanation
Correct option: B
I < IV < III < II < V
The correct answer is B (I < IV < III < II < V) because boiling points increase with increasing molecular weight and strength of intermolecular forces, with alcohols having the highest due to hydrogen bonding.
156 Medium
156 of 165
Application +4 | -1
0.759 g of a silver salt of a dibasic organic acid on ignition left 0.463 g metallic silver. The equivalent weight of acid is:
View answer and explanation
Correct option: A
70
Option A (70) is correct because the equivalent weight of the acid is calculated using the equivalent weights of the silver salt and silver.
157 Medium
157 of 165
Understanding +4 | -1
C6H5CH=CHCHO⟶XC6H5CH=CHCH2OH\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}=\mathrm{CHCHO} \stackrel{\mathrm{X}}{\longrightarrow} \mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}=\mathrm{CHCH}_2 \mathrm{OH} In the above sequence X\mathrm{X} can be :
View answer and explanation
Correct option: B
NaBH4\mathrm{NaBH}_4
Option B (NaBH4\mathrm{NaBH}_4) is correct because NaBH4NaBH_4 is a selective reducing agent that reduces aldehydes to primary alcohols without affecting carbon-carbon double bonds.
158 Medium
158 of 165
Remembering +4 | -1
The reverse of esterification is known as:
View answer and explanation
Correct option: C
Hydrolysis
Option C (Hydrolysis) is correct because hydrolysis is the reverse reaction of esterification, where an ester reacts with water to form a carboxylic acid and an alcohol.
159 Medium
159 of 165
Remembering +4 | -1
Silver mirror test is given by which one of the
following compounds?
View answer and explanation
Correct option: A
Acetaldehyde
Option A (Acetaldehyde) is correct because aldehydes give a positive silver mirror test.
160 Medium
160 of 165
Understanding +4 | -1
Given below are two statements:

Statement I: The esterification of carboxylic acid with an alcohol is a nucleophilic acyl substitution.

Statement II: Electron withdrawing groups in the carboxylic acid will increase the rate of esterification reaction.

Choose the most appropriate option:
View answer and explanation
Correct option: A
Both Statement I and Statement II are correct
Both Statement I and Statement II are correct. Esterification is indeed a nucleophilic acyl substitution, and electron-withdrawing groups increase the rate of esterification by stabilizing the transition state.
161 Medium
161 of 165
Remembering +4 | -1
In the reaction, HCHO+NH3→X,X\mathrm{HCHO} + \mathrm{N}{\mathrm{H}_3} \to X,X is
View answer and explanation
Correct option: C
urotropine
Option C (urotropine) is correct because formaldehyde reacts with ammonia to form hexamethylenetetramine, also known as urotropine.
162 Medium
162 of 165
Understanding +4 | -1
Which of the following statement is correct?
View answer and explanation
Correct option: C
Boiling points of acids are higher than corresponding alcohols.
Option C (Boiling points of acids are higher than corresponding alcohols) is correct because carboxylic acids form stronger hydrogen bonds than alcohols, leading to higher boiling points.
163 Medium
163 of 165
Analyzing +4 | -1
Which of the following aldehydes on chlorination will give a product, which can be used for the synthesis of DDT?
View answer and explanation
Correct option: B
CH3CHO\mathrm{C}{\mathrm{H}_3}\mathrm{CHO}
Option B is correct because chlorination of acetaldehyde yields chloral, which is used in the synthesis of DDT.
164 Medium
164 of 165
Analyzing +4 | -1
Which is the incorrect order of increasing acidic strength for the following?
View answer and explanation
Correct option: D
HCOOH<C6H5COOH\mathrm{HCOOH} < \mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}
Option D (HCOOH < C6H5COOH) is the incorrect order because benzoic acid is more acidic than formic acid due to resonance stabilization of the benzoate ion.
165 Medium
165 of 165
Application +4 | -1
Propanoic acid on warming with Cl2\mathrm{C}{\mathrm{l}_2} in presence of red P gives:
View answer and explanation
Correct option: C
CH3CHClCOOH\mathrm{C}{\mathrm{H}_3}\mathrm{CHClCOOH}
Option A (1.20×10−81.20 \times 10^{-8}) is correct because the number of Einstein units is calculated by dividing the number of photons by Avogadro's number.
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