Question

Which of the following compounds will show positive silver mirror test ?

• A. $\ce{CH_3(CH_2OH)_3CHO}$
• B. $\ce{CH_3COCH(OH)CH_3}$
• C. $\ce{HCOOH}$
• D. All.

Answer 1

Answer: (D)

All.

Answer 2

Both $A$ and $C$ have $H - \overset{\underset{||}{O}}{C} -$ group . It is to be noted that all aldehydes and only formic acid act as a reducing agent. (B) is an a-hydroxy ketone and it also reduces Tollen?? reagent.