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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Aldehydes and Ketones

NTA Abhyas 2020 · Chemistry · Aldehydes and Ketones

How many among the following compounds will give the above result?...

How many among the following compounds will give the above result? i. Cyclohexanone ii. Acetone iii. Propionaldehyde
How many among the following compounds will give the above result?
i. Cyclohexanone
ii. Acetone
iii. Propionaldehyde
iv. Acetophenone
v. Acetaldehyde
vi. Benzophenone
vii. Benzaldehyde

Options

  1. A2
  2. B3
  3. C4
  4. D5

Correct answer

A. 2

Step-by-step solution

Positive 2,4−DNP2,4 - DNP test ⇒⇒ Carbonyl group. Positive Fehling's test ⇒⇒ Aliphatic aldehyde group. Aromatic aldehydes and ketones do not give Fehling's test. Hence, among the given options, compounds
(iii) and (v) will give positive 2,4−DNP2,4 - DNP and Fehling's test.
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