Acetaldehyde and Acetone can be distinguished by

An organic compound $B$ is formed by the reaction of ethylmagnesium iodide $(CH_3CH_2MgI)$ with a substance $A,$ followed by treatment with dilute aqueous acid. Compound $B$ does not react with $PCC$ in dichloromethane. Identify $A$.

The major product of the following reaction is:

In the reaction $CH_3CH_2OH \xrightarrow{OH^-} CH_3CHO$,which carbon atom undergoes oxidation?

Which of the following does not reduce Fehling solution?

Which of the following reactions represents Clemmensen reduction?