Marsh gas mainly contains .........

The correct order of boiling points of the following molecules is:
$(i)$ $n$-Hexane
$(ii)$ $2$-methylpentane
$(iii)$ $2,3$-dimethylbutane

What is the number of moles of nascent hydrogen required to prepare $1$ mole of methane from iodomethane?

What is the major product?
$(CH_3-CH_2)_2CuLi \xrightarrow{CH_3-Cl} \text{Product}$

The alkane that gives only one mono-chloro product on chlorination with $Cl_2$ in the presence of diffused sunlight is:

$n$-Butane $\xrightarrow{Cl_2/hv}$ Give the total number of monochloro products (including stereoisomers) possible in the above reaction.