Identify the product $A$ in the following reaction:
$C_6H_{11}CH_2Br \xrightarrow{Na, \text{Dry ether}} A$

The compound $(X)$ on $(i)$ heating in the presence of anhydrous $AlCl_3$ and $HCl$ gas gives $2,4$-dimethylpentane, $(ii)$ aromatization gives toluene, and $(iii)$ cyclisation gives methylcyclohexane. The correct name of compound $(X)$ is:

The reaction $CH_3Br + 2Na + BrCH_3 \to C_2H_6 + 2NaBr$ is known as ............ reaction.

In the following reaction,the major product is
$H_2C=C(CH_3)-CH=CH_2 \xrightarrow{1 \text{ equivalent } HBr}$

What is the difference in molar masses of the third and fourth homologues of the alkane series?

Petroleum consists mainly of