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Question

Acetaldehyde and benzaldehyde can be differentiated by :
  1. Tollen's reagent
  2. Iodoform test
  3. Fehling test
  4. both (a) and (b)

A
Tollen's reagent
B
both (a) and (b)
C
Fehling test
D
Iodoform test
Solution
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(Refer to Image 1)
For iodoform test one methyl must be there with carbonyl group. Thus acetaldehyde will give iodoform test and benzaldehyde does not.
(Refer to Image 2)
In Fehling test, enolate formation takes place, thus Aldehydes that lack alpha hydrogen cannot form an enolate and thus do not give a positive Fehling's test.
Thus Benzaldehyde do not give Fehling test as it do not have α Hydrogen. While Acetaldehyde have 3αHydrogen thus it can form enolate and undergo Fehling test.
Thus Benzaldehyde & Acetaldehyde can be differentiated using Iodoform and Fehling test.

1115961_994848_ans_3fc6ad0cd7414797b27faa1d7b322d42.png

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