The main constituent of marsh gas is:

In the preparation of $n$-butane by the reaction of $C_2H_5I$ with $Na$ in the presence of ether,which of the following impurities is involved?

Total number of isomeric compounds (including stereoisomers) formed by monochlorination of $2$-methylbutane is................

The reaction of $n$-butane with bromine in the presence of light at $725\,^oC$ yields ...................

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

Which one of the following compounds gives methane on treatment with water?