Question

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
• C. A only
• D. B and C only

Answer 1

Answer: (B)

A, B and C only

Answer 2

The silver mirror test is a chemical test used to identify aldehydes. Aldehydes, when treated with ammoniacal silver nitrate (Tollens’ reagent), reduce silver ions to metallic silver, forming a mirror-like deposit.
- Formic acid (A) is an aldehyde and will react with Tollens’ reagent.
- Formaldehyde (B) is also an aldehyde and will give a positive silver mirror test.
- Benzaldehyde (C) is another aldehyde and will also give a positive silver mirror test.
- Acetone (D) is a ketone and does not reduce Tollens’ reagent, so it will not give a silver mirror.
Thus, the correct answer is (2), A, B, and C only.