Which of the following gives a silver mirror with Tollen's reagent?

Which of the following gives a silver mirror with Tollen's reagent? 

A. alkanal

B. alkanone

C. alkane

D. alkanoic acid

Tollens’ reagent gives a silver mirror with compounds that contain the aldehyde (–CHO) group.

Among the options:

• Alkanal (aldehyde) → gives silver mirror ✅

• Alkanone (ketone) → does not react

• Alkane → no reaction

• Alkanoic acid → no silver mirror

✅ Correct answer: A. alkanal

Exam tip:
Tollens’ reagent is a test for aldehydes, not ketones.

PQN:25