Aldehydes Ketones and Carboxylic Acids — DPP 3

20 NEET questions from Aldehydes Ketones and Carboxylic Acids, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

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1
Aldehydes Ketones and Carboxylic Acids – NEET-20250
  1. A $\mathrm{CH}_{3} \mathrm{COOH}$
  2. B $\mathrm{CH}_{3}-\mathrm{CN}$
  3. C $\mathrm{CH}_{3}-\mathrm{CH}_{3}$
  4. D $\mathrm{CH}_{3}-\mathrm{CHO}$
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20250
2
Which of the following does not reduces the carboxylic acids into alcohol ?
  1. A $\xrightarrow[\text { 2. } \mathrm{H}_{3} \mathrm{O}^{+}]{\text {1. } \mathrm{LiAlH}_{4} / \text { ether }}$
  2. B $\xrightarrow[2 . \mathrm{H}_{3} \mathrm{O}^{+}]{1 . \mathrm{B}_{2} \mathrm{H}_{6}}$
  3. C $\mathrm{NaBH}_{4}$
  4. D $\xrightarrow[\mathrm{H}^{+}]{\mathrm{ROH}} ~~\xrightarrow[\text { Catalyst }]{\mathrm{H}_{2}}$
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Correct answer: C

$\mathrm{NaBH}_{4}$ cannot reduce carboxylic acid to alcohol.
3
Which of the following reaction does not gives benzoic acid
  1. A $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } - \mathrm { CH } _ { 3 } \xrightarrow [ \mathrm { KMnO } _ { 4 } ] { \text { Acidic } }$
  2. B $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } - \mathrm { CH } _ { 3 } \xrightarrow [ \mathrm { H } _ { 2 } \mathrm { O } ] { \mathrm { CrO } _ { 2 } \mathrm { Cl } _ { 2 } } \xrightarrow { [ \mathrm { O } ] }$
  3. C $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { C } \equiv \mathrm { CH } \xrightarrow { \text { Acidic } }$
  4. D
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Correct answer: D

Aldehydes Ketones and Carboxylic Acids – NEET-20252
4
The compounds $\mathrm { A } , \mathrm { B }$ and C in the reaction sequence
Aldehydes Ketones and Carboxylic Acids – NEET-20307 are given by the set :-
  1. A $\mathrm { CHI } _ { 3 } , \mathrm { H } _ { 2 } \mathrm { C } = \mathrm { CH } _ { 2 } , \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } - \mathrm { OH }$
  2. B $\mathrm{CHI}_{3}, \mathrm{HC} \equiv \mathrm{CH}, \mathrm{CH}_{3} \mathrm{CHO}$
  3. C $\mathrm { CHI } _ { 3 } , \mathrm { CH } _ { 3 } - \mathrm { C } \equiv \mathrm { CH } , \mathrm { CH } _ { 3 } \mathrm { COCH } _ { 3 }$
  4. D
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20307
5
Which of the following reagents may be used to distinguish between phenol and benzoic acid?
  1. A Victor-Mayer test
  2. B Neutral $\mathrm{FeCl}_{3}$
  3. C Aqueous NaOH
  4. D Tollen's reagent
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Correct answer: B

Neutral $\mathrm{FeCl}_{3}$
Phenol ⟶ ✓ Violet colour complex
Benzoic acid ⟶ Buff coloured
6
Which is most reactive towards hydrolysis.
  1. A
  2. B
  3. C
  4. D
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Correct answer: B

Reactivity towards Alkaline Hydrolysis ∝ Electrophilicity of Carbonyl group ∝ M ∝ I
Aldehydes Ketones and Carboxylic Acids – NEET-20243 Aldehydes Ketones and Carboxylic Acids – NEET-20243

7
Which of the following product is obtained when bleaching powder is distilled with acetone
  1. A $\mathrm { CCl } _ { 4 }$
  2. B $\mathrm { CHCl } _ { 3 }$
  3. C $\mathrm { CH } _ { 3 } - \mathrm { CH } _ { 3 }$
  4. D All
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Correct answer: B

Acetone is mixed with bleaching powder to give chloroform.
$\mathrm{CaOCl}_{2}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Cl}_{2}$
(Bleaching powder)
Aldehydes Ketones and Carboxylic Acids – NEET-20208
8
The reduction of acetamide gives :-
  1. A $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{NH}_{2}$
  2. B $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHNH}_{2}$
  3. C $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CNH}_{2}$
  4. D $\left(\mathrm{CH}_{3} \mathrm{CH}_{2}\right)_{2} \mathrm{NH}$
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Correct answer: A

Aldehydes Ketones and Carboxylic Acids – NEET-20247
9
Cyanohydrin of the following compound on hydrolysis gives compound that can show optical isomerism :
  1. A HCHO
  2. B $\mathrm{CH}_{3} \mathrm{CHO}$
  3. C $\mathrm{CH}_{3} \mathrm{COCH}_{3}$
  4. D All the above
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20302 Unsym. aldehyde/ketone $\xrightarrow{\mathrm{HCN} / \mathrm{OH}^{-}}$Show OI.
10
Select the correct option for the following reaction:
Aldehydes Ketones and Carboxylic Acids – NEET-20299
  1. A The position of equilibrium is on RHS for most ketones
  2. B The position of equilibrium is on LHS for most aldehydes
  3. C The hydrogen sulphite addition compound is water insoluble
  4. D Sulphite addition compounds are useful for separation and purification of aldehydes
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Correct answer: D

Aldehyde ✓
Only methyl aliphatic ketone ✓
Aromatic ketone ✗
11
Aldehydes Ketones and Carboxylic Acids – NEET-20251
  1. A
  2. B
  3. C
  4. D
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20251
12
Which of the following aldehydes does not form iodoform on heating with iodine and alkali :-
  1. A
  2. B $\mathrm { ICH } _ { 2 } \mathrm { CHO }$
  3. C $\mathrm { CH } _ { 3 } - \mathrm { CH } _ { 2 } - \mathrm { CHO }$
  4. D
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Correct answer: C

Iodo form test is given by those compounds which have and
Aldehydes Ketones and Carboxylic Acids – NEET-20304 group.
13
$\mathrm{CH}_{3} \mathrm{CHO}$ and $\mathrm{CH}_{3} \mathrm{COCH}_{3}$ can not be distinguished by :-
  1. A Fehling solution
  2. B Grignard reagent
  3. C Schiff's reagent
  4. D Tollen's reagent
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20308
14
Identify z in the following series
$\mathrm{CH}_{2}=\mathrm{CH}_{2} \xrightarrow{\mathrm{HBr}} \mathrm{x} \xrightarrow{\text { Hydrolysis }} \mathrm{y} \xrightarrow{\mathrm{I}_{2} / \mathrm{NaOH}} \mathrm{z}$
  1. A $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{I}$
  2. B $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$
  3. C $\mathrm{CHI}_{3}$
  4. D $\mathrm{CH}_{3} \mathrm{CHO}$
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Correct answer: C

Aldehydes Ketones and Carboxylic Acids – NEET-20206 ∴ Z is CHI$_{3}$
15
Hydrazine on reaction with acetone gives:-
  1. A Acetylene
  2. B Hydrazone
  3. C Nitrochloroform
  4. D Chloroacetone
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20255
16
In the reaction sequence
$\mathrm { RCOCl } + \mathrm { H } _ { 2 } \xrightarrow { \mathrm { Pd } + \mathrm { RaSO } _ { 4 } } \mathrm {~A} \xrightarrow { \mathrm { HCN } } \mathrm {~B} \xrightarrow { \mathrm { H } _ { 2 } \mathrm { O } ^ { \oplus } } \mathrm { C }$
$\mathrm { A } , \mathrm { B }$ and C are given by the set :-
  1. A $\mathrm { RCHO } , \mathrm { RCH } ( \mathrm { OH } ) \mathrm { CN } , \mathrm { RCH } ( \mathrm { OH } ) \mathrm { CH } _ { 2 } \mathrm { NH } _ { 2 }$
  2. B $\mathrm { RCHO } , \mathrm { RCH } ( \mathrm { OH } ) \mathrm { CN } , \mathrm { RCH } ( \mathrm { OH } ) \mathrm { COOH }$
  3. C
  4. D $\mathrm { RCHO } , \mathrm { R } - \mathrm { CH } _ { 2 } - \mathrm { CN } , \mathrm { R } - \mathrm { CH } _ { 2 } - \mathrm { COOH }$
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Correct answer: B

$\mathrm{RCOCl}+\mathrm{H}_{2} \xrightarrow{\mathrm{Pd}+\mathrm{BaSO}_{4}} \mathrm{RCHO} \xrightarrow{\mathrm{HCN}}$
Aldehydes Ketones and Carboxylic Acids – NEET-20257
17
Which of the following pair is differentiated by iodoform test?
  1. A
  2. B
  3. C
  4. D
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Correct answer: B

Condition for Iodoform test :- presence of
Aldehydes Ketones and Carboxylic Acids – NEET-20205 Aldehydes Ketones and Carboxylic Acids – NEET-20205 have methyl keto group. Aldehydes Ketones and Carboxylic Acids – NEET-20205 do not have methyl keto group.
18
Choose the correct alternative from the following.
  1. A Ketones are more reactive than aldehydes towards NAR.
  2. B Aldehydes are more reactive than ketones towards NAR.
  3. C Formaldehyde is the least reactive carbonyl Compound towards NAR
  4. D Steric hindrance does not play a role to effect the reactivity of carbonyl compounds towards NAR.
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Correct answer: B

NAR ⇒ Aldehydes > ketone.
reactivity due to less steric hindrance.
$\mathrm{HCHO} \Rightarrow$ most reactive due to less steric hindrance.
19
Which of the following can be used to prepare benzaldehyde?
Aldehydes Ketones and Carboxylic Acids – NEET-20259
  1. A I, II
  2. B II, III, IV
  3. C I, III, IV
  4. D I, II, III, IV
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Correct answer: D

Aldehydes Ketones and Carboxylic Acids – NEET-20259
20
In the reaction sequenceAldehydes Ketones and Carboxylic Acids – NEET-20258 $\mathrm { A } , \mathrm { B }$ and C are given by the set :-
  1. A $\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CHO } , \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { Cl } , \mathrm { CHI } _ { 3 }$
  2. B
  3. C
  4. D
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Correct answer: C

Aldehydes Ketones and Carboxylic Acids – NEET-20258

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