Which of the following hydrocarbons will be in a liquid state at room temperature?

$CH_3-CH(CH_3)-CH_2-CH_3 \xrightarrow{Cl_2/h\nu} N$ (number of isomers) $\xrightarrow{\text{Fractional distillation}} (F)$. Find $N$ and $F$.

Give the order for the substitution of hydrogen atoms in alkane compounds.

What will be the major product when propane is reacted with $HNO_3$ vapour at high temperature?

Which branched chain isomer of the hydrocarbon with molecular mass $72 \ u$ gives only one isomer of mono-substituted alkyl halide?

Give the methods of preparation of alkanes. Write the general reactions.