Aldehydes Ketones and Carboxylic Acids — DPP 1

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
Select the incorrect option :
Conversion ⟶ Reagent
(i) Hexan-1-ol ⟶ hexanal $\mathrm{C}_{5} \mathrm{H}_{5} \mathrm{NH}^{+} \mathrm{CrO}_{3} \mathrm{Cl}^{-}$
(ii) Ethanenitrile ⟶ Ethanal DIBAL-H
(iii) p-fluorotoluene, ⟶ $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{H}^{+}$ p-fluorobenzaldehyde
(iv) But-2-ene ⟶ Ethanal $\mathrm{O}_{3}, \mathrm{H}_{2} \mathrm{O}-\mathrm{Zn}$ dust
  1. A Hexan-1-ol ⟶ hexanal $\mathrm{C}_{5} \mathrm{H}_{5} \mathrm{NH}^{+} \mathrm{CrO}_{3} \mathrm{Cl}^{-}$
  2. B Ethanenitrile ⟶ Ethanal DIBAL-H
  3. C p-fluorotoluene, ⟶ $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{H}^{+}$ p-fluorobenzaldehyde
  4. D But-2-ene ⟶ Ethanal $\mathrm{O}_{3}, \mathrm{H}_{2} \mathrm{O}-\mathrm{Zn}$ dust
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Correct answer: C

Aldehydes Ketones and Carboxylic Acids – NEET-20136
2
The major organic product formed from the following reaction is :-
Aldehydes Ketones and Carboxylic Acids – NEET-20166
  1. A
  2. B
  3. C
  4. D
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20166
3
Aldehydes Ketones and Carboxylic Acids – NEET-20197 can be converted to
Aldehydes Ketones and Carboxylic Acids – NEET-20197 by:
  1. A Red $\mathrm{P}+\mathrm{HI}$
  2. B Wolf Kishner reduction
  3. C Clemmensen reaction
  4. D All
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Correct answer: D

Aldehydes Ketones and Carboxylic Acids – NEET-20197 Clemmenson reduction $\mathrm{Zn}-\mathrm{Hg} / \mathrm{H}^{\oplus}$
Red $\mathrm{P}+\mathrm{HI}$
4
Aldehydes Ketones and Carboxylic Acids – NEET-20138 The product D is :-
  1. A $\mathrm { CH } _ { 2 } = \mathrm { CH } _ { 2 }$
  2. B
  3. C
  4. D $\mathrm { CH } _ { 3 } - \mathrm { CH } = \mathrm { CH } - \mathrm { CHO }$
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Correct answer: D

Aldehydes Ketones and Carboxylic Acids – NEET-20138
5
Ketones can be prepared by :-
  1. A Rosenmund reduction
  2. B Etard reaction
  3. C Cannizzaro reaction
  4. D Friedel-Craft reaction
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Correct answer: D

Aldehydes Ketones and Carboxylic Acids – NEET-20129
6
Aldehydes Ketones and Carboxylic Acids – NEET-20127 can be obtained by :-
  1. A
  2. B
  3. C
  4. D None of the above
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Correct answer: A

Aldehydes Ketones and Carboxylic Acids – NEET-20127
7
Carbonyl group is converted into methylene group by -
  1. A Acidic reduction
  2. B Raney Ni
  3. C Basic hydrolysis
  4. D Normal Hydrogenation
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Correct answer: A

Aldehydes Ketones and Carboxylic Acids – NEET-20153
8
Which does not react with $\mathrm { NaHSO } _ { 3 }$.
  1. A
  2. B
  3. C
  4. D
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Correct answer: C

Aldehydes Ketones and Carboxylic Acids – NEET-20198 white crystal (water soluble)
All aldehyde ✓
Only Aliphatic methyl ketones ✓
Aromatic ketones ✗
9
The most suitable reagent for the conversion of $\mathrm{RCH}_{2} \mathrm{OH} \longrightarrow \mathrm{RCHO}$
  1. A $\mathrm{KMnO}_{4}$
  2. B $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$
  3. C $\mathrm{CrO}_{3} / \mathrm{H}_{2} \mathrm{SO}_{4}$
  4. D PCC (Pyridinium chloro chromate)
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Correct answer: D

Aldehydes Ketones and Carboxylic Acids – NEET-20131 other are strong O.A. → further oxidation possible into acid.
10
Aldehydes Ketones and Carboxylic Acids – NEET-20199 and
Aldehydes Ketones and Carboxylic Acids – NEET-20199 are readily distinguished by their reaction with :-
  1. A Iodine and alkali
  2. B 2,4-dinitrophenylhydrazine
  3. C Tollen's reagent
  4. D All the above
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Correct answer: C

Aldehydes Ketones and Carboxylic Acids – NEET-20199
11
Select the structure of chromium complex formed by the reaction of toluene with chromylchloride followed by hydrolysis to give benzaldehyde and also the name of the reaction.
  1. A
  2. B
  3. C
  4. D
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20155
12
Select the correct statement for $\mathrm { C } = \mathrm { O }$ and $\mathrm { C } = \mathrm { C }$ bond.
  1. A Carbon-Oxygen double bond is polar but carbon-carbon double bond is non-polar
  2. B Carbon-Oxygen bond length is 123 pm than that of carbon-carbon bond length is 134 pm
  3. C Carbonyl compounds undergo nucleophilic addition reaction but compounds containing ethylenic double bonds undergo electrophilic addition reaction
  4. D All of these
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Correct answer: D

Aldehydes Ketones and Carboxylic Acids – NEET-20169
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-20171
14
Brady's reagent is
  1. A $\left[ \mathrm { Cu } \left( \mathrm { NH } _ { 3 } \right) _ { 4 } \right] \mathrm { SO } _ { 4 }$
  2. B $\mathrm { KMnO } _ { 4 } / \mathrm { NaIO } _ { 4 }$
  3. C
  4. D
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Correct answer: C

Brady's reagent
Aldehydes Ketones and Carboxylic Acids – NEET-20164

15
Which of the following reaction will not give ketone?
  1. A $\mathrm { R } - \mathrm { MgX } + \xrightarrow { \mathrm { R } - \mathrm { COCl } }$
  2. B $\mathrm { R } - \mathrm { CN } + \mathrm { R } - \mathrm { MgX } \xrightarrow { \mathrm { H } _ { 3 } \mathrm { O } ^ { + } }$
  3. C
  4. D
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Correct answer: D

Aldehydes Ketones and Carboxylic Acids – NEET-20133
16
Acetone does not form :-
  1. A A phenylhydrazone with phenylhydrazine
  2. B A sodium bisulphite adduct with sodium bisulphite
  3. C A silver mirror with Tollen's reagent
  4. D An oxime with hydroxylamine
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Correct answer: C

Aldehydes Ketones and Carboxylic Acids – NEET-20156 Tollen test is given by Aldehyde, formic acid α-hydroxy ketone, hemiacetal group.
17
Aldehydes Ketones and Carboxylic Acids – NEET-20125
  1. A $80 \% d + 20 \% \ell$
  2. B $50 \% d + 50 \% \ell$
  3. C Meso compound
  4. D Optically active
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Correct answer: A

Aldehydes Ketones and Carboxylic Acids – NEET-20125
18
Aldehydes Ketones and Carboxylic Acids – NEET-20168
  1. A
  2. B
  3. C
  4. D
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20168
19
Acetaldehyde on warming with Fehling's solution gives a red precipitate of :-
  1. A Elemental copper
  2. B Cuprous oxide
  3. C Cupric oxide
  4. D Mixture of all of the above
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20170
20
When acetaldol is treated with excess of acid then unsaturated product will be :-
  1. A Alcohol
  2. B Aldehyde
  3. C Acid
  4. D Alkyl halide
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Correct answer: B

Aldehydes Ketones and Carboxylic Acids – NEET-20165

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