What is the major product of the following reaction? $CH_3-C \equiv C-CH_2-CH_3 \xrightarrow{1 \ mol \ of \ Cl_2} \text{?}$

Which one of the following compounds will react with methyl magnesium iodide?

The colorless gas produced by the reaction of calcium carbide with water is.....

For a molecular formula of $C_6H_{10}$ of an alkyne series,the number of possible branched isomers is

$But-1-yne$ reacts with cold alkaline $KMnO_4$ to produce:

Compound $(X)$ [styrene] is subjected to the following sequence of reactions: $(i)$ $Br_2/CHCl_3$,$(ii)$ $NaNH_2$ (excess),$(iii)$ $CH_3I$,$(iv)$ $H_2, Na/NH_3(l)$,giving Major Product $(Y)$. The molar mass of the major product $(Y)$ formed is . . . . . . $\text{g mol}^{-1}$. (Given molar mass in $\text{g mol}^{-1}$: $C:12, H:1$)