The cycloalkane formed when $1,4$-dibromopentane is heated with sodium is:

Pure methane can be prepared by

Assertion $(A):$ Sodium acetate on Kolbe's electrolysis gives ethane.
Reason $(R):$ Methyl free radical is formed at cathode.

Give the decreasing order of reactivity for the halogenation reaction of alkanes.

$5 \, L$ of an alkane requires $25 \, L$ of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure,the alkane is

In the dichlorination reaction of propane,a mixture of products is obtained. How many isomers does the mixture contain?