Which of the following organic compounds has the same hybridization as its combustion product $(CO_2)$?

$Ph-CCl_2-CH_3 \xrightarrow{3NaNH_2} \text{Product } (A)$; Product $(A)$ is

$2-$Butyne reacts with $Na$ in liquid $NH_3$ to form:

When $1,2-$dibromopropane is treated with $X$ moles of $NaNH_2$,the resulting compound reacts with ethyl bromide to form pentyne. What is the value of $X$?

An organic compound has a triple bond and no double bond. It can be tested by:

In which reaction is the final product $Ph-C \equiv CH$?