Normal butane is converted into isobutane by:

$A$ mixture of all isomers possible from the mono-chlorination of the structure $n$-pentane $(CH_3-CH_2-CH_2-CH_2-CH_3)$ is subjected to fractional distillation. How many fractions will be obtained?

Isomers of hexane,based on their branching,can be divided into three distinct classes as shown in the figure. The correct order of their boiling point is

Which of the following is $NOT$ obtained when a mixture of bromoethane and $1$-bromopropane is treated with sodium metal in dry ether?

$Ph^{-}MgCl \xrightarrow{\text{Hydrolysis}} \text{Product}$
Product will be

Which of the following gases has the highest heat of combustion?