In alkanes,the bond angle is $...^o$.

What is the molecular formula of an alkane if it exhibits three structural isomers?

How many products (including stereoisomers) are expected from the monochlorination of the following compound? (Structure: $(CH_3)_2CH-CH_2-CH_3$)

The total number of monobromo derivatives formed by the alkanes with molecular formula $C_{5}H_{12}$ is (excluding stereoisomers) $.....$

The photochemical chlorination of alkanes is initiated by .....

Give an example of the preparation of an alkane from an alkyl halide.