$CH_3-CH_2-CH_2-C\equiv CH + LiNH_2 \to (A) \xrightarrow{(CH_3)_2SO_4} (B)$
Give the structural formula of compound $(B)$.

Identify the structure of the final product $(D)$ in the following sequence of reactions:
$Ph-CO-CH_3$ $\xrightarrow{PCl_5, \Delta} A$ $\xrightarrow{3 \text{ eq. } NaNH_2/NH_3} B$ $\xrightarrow{\text{Acidify}} C$ $\xrightarrow{1. B_2H_6, 2. H_2O_2/OH^-} D$
Total number of $sp^2$ hybridised carbon atoms in product $D$ is:

What is the major organic product of the following reaction?
$Ph-C \equiv CH \xrightarrow[H_2SO_4]{Hg^{2+}, H_2O} ?$

$CH_3-C \equiv CH$ $\xrightarrow{Na} X$ $\xrightarrow{CH_3-Cl} Y$,$Y$ is

The reaction of $1,2-$dibromoethane with alcoholic $KOH$ yields product $X$. What is the hybridization of the carbon atoms in $X$?

Ethyne can be obtained from.......