The catalyst used for the isomerisation of $n$-alkanes to branched chain alkanes is

Which of the following alkanes is optically active?

Electrolysis of an aqueous solution containing sodium acetate and sodium propionate yields ..........

An alkane forms isomers if the number of carbon atoms is at least

The gas responsible for explosions in coal mines is .......

$RMgI$ when treated with ice-cold water liberated a gas which occupied $1.4 \text{ dm}^3/\text{g}$ at $STP$. The gas produced is further reacted with iodine in the presence of $HIO_3$ to give compound $(X)$. Compound $(X)$ in the presence of $Na$ and dry ether produced compound $(Y)$. The molar mass of compound $(Y)$ is . . . . . . $\text{g mol}^{-1}$. (Nearest integer)