The product of the following reaction is:

In the following reaction sequence,the correct structures of $E, F$ and $G$ are

Which of the following compounds does $NOT$ undergo haloform reaction?

The reagents $A$,$B$ and $C$ respectively are:

In the presence of dil. $HCl$,compound $A$ is converted to a constitutional isomer $(B)$. Compound $B$ is:

An organic compound '$X$' having molecular formula $C_5H_{10}O$ yields phenylhydrazone and gives negative response to the iodoform test and Tollens' test. It produces $n-$pentane on reduction. '$X$' could be