Give the reaction for the formation of $n$-butane from ethane.

$A$ hydrocarbon of molecular mass $72 \ g \ mol^{-1}$ gives a single monochloro derivative and two dichloro derivatives on photochlorination. Give the structure of the hydrocarbon.

Given below are two statements:
Statement $I$: Methane can be prepared by decarboxylation of sodium ethanoate, Kolbe's electrolysis of sodium acetate and reaction of $CH_3MgBr$ with water.
Statement $II$: Methane cannot be prepared from unsaturated hydrocarbons and by Wurtz reaction.
In the light of the above statements, choose the correct answer from the options given below.

The alkane which is next to methane in the homologous series can be prepared from which of the following reactions?
$I$. $2 CH_3 Br \xrightarrow[\text{dry ether}]{Na}$
$II$. $CH_3 COOH \xrightarrow[CaO, \Delta]{NaOH}$
$III$. $CH_3 CH=CH_2 \xrightarrow{H_2 / Pt}$
$IV$. $CH_3 CH_2 Br \xrightarrow[H^{+}]{Zn}$
Correct answer is

When $methyl \ bromide$ is heated with $Zn$,it gives:

Identify the major product formed when the following compound reacts with $NBS$ ($N$-Bromosuccinimide):
$CH_3-C_6H_4-CH(CH_3)-C_6H_4-CH_2CH_3 \xrightarrow{NBS} \text{Major Product}$