In the reaction sequence $CaC_2$ $\xrightarrow{H_2O} A$ $\xrightarrow[dil. H_2SO_4]{Hg^{+2}} B$ $\xrightarrow{Ni} H_2 C$,the product $C$ is:

An organic compound $X$ with molecular formula $C_6H_{10}$,when treated with $HBr$,forms a $gem$-dibromide. The compound $X$ upon warming with $HgSO_4$ and dil. $H_2SO_4$,produces a ketone,which gives a positive iodoform test. The compound $X$ is

What is the product formed when $CH_3CH_2CHCl_2$ is treated with $NaNH_2$?

$Ca + C$ $\xrightarrow[\Delta ]{} A$ $\xrightarrow{H_2O} B$ $\xrightarrow{\text{cyclic polymerisation}} C$
Product $B$ and $C$ are respectively

When propyne is treated with dilute $H_2SO_4$ and $HgSO_4$,the major product is

Consider the following reaction sequences and choose the correct option:
$L \xrightarrow{Na/liq. NH_3} Ph-C \equiv C-Me \xrightarrow[Lindlar's \ Catalyst]{H_2, Pd/C} K$
$L \xrightarrow{HBr, \text{benzoyl peroxide}} N$
$K \xrightarrow{HBr} M$