Cyclo$[18]$ carbon is an allotrope of carbon with molecular formula $C_{18}$. It is a ring of $18$ carbon atoms, connected by alternating single and triple bonds. The total number of triple bonds present in this cyclocarbon is:

In the following reaction sequence: $Ph-CH=CH-Ph$ $\xrightarrow{Br_2/CCl_4} (A)$ $\xrightarrow{2NaNH_2} (B)$ $\xrightarrow{H_2/Pd-CaCO_3} (C)$,the product $(C)$ is:

When $2$-butyne is treated with $Pd-BaSO_4$ (Lindlar's catalyst),the product formed will be:

Which product is obtained from the reaction of calcium carbide with water?

$0.40 \, g$ of an organic compound $(A)$ with molecular formula $C_5H_8O$ reacts with $x$ moles of $CH_3MgBr$ to liberate $224 \, mL$ of a gas at $STP$. Upon hydrogenation with excess $H_2$,$(A)$ yields pentan-$1$-ol. The correct structure of $(A)$ is:

The reaction of silver powder with chloroform produces $....$.