JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Aldehydes Ketones and Carboxylic Acids

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Which of the following compounds will give silver mirror with ammoniacal silver nitrate?
(A) Formic acid
(B) Formaldehyde
(C) Benzaldehyde
(D) Acetone

Choose the correct answer from the options given below :

(A)C and D only
(B)A, B and C only✓ Correct
(C)A only
(D)B and C only

Answer: (B)

Solution

Tollens' reagent (ammoniacal AgNO

_{3}

) oxidises aldehydes (giving a silver mirror). Formaldehyde and benzaldehyde are aldehydes and respond positively. Formic acid (HCOOH) also contains an aldehyde-like –CHO group within its structure and gives a positive silver mirror test as well. Acetone, a ketone, does not respond.

So A, B and C give a positive test — answer: A, B and C only.

JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Single correct option

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