Which of the following reagents is used to distinguish between acetone and acetophenone?

Which of the following can undergo a disproportionation reaction on heating with concentrated alkali?

The test to differentiate between $\text{pentan-2-one}$ and $\text{pentan-3-one}$ is

The rate of hydrate formation for the given compounds is:

An optically active alkyl bromide $C_4H_9Br$ reacts with ethanolic $KOH$ to form major compound $[A]$, which reacts with bromine to give compound $[B]$. Compound $[B]$ reacts with ethanolic $KOH$ and sodamide to give compound $[C]$. One molecule of water adds to compound $[C]$ on warming with mercuric sulphate and dilute sulphuric acid at $333 \text{ K}$ to form compound $[D]$. The functional group in compound $[D]$ will be confirmed by:

To distinguish between formaldehyde and acetaldehyde,we require