Which of the following methods can be used for the preparation of methane?

$2, 3-$dimethylhexane contains tertiary,secondary,and primary carbon atoms,respectively:

$A$ sample of gasoline contains $81\%$ iso-octane and $19\%$ $n$-heptane. Its octane number will be

Which of the following compounds is used in antiknock compositions to prevent the deposition of lead oxides on spark plugs,combustion chambers,and exhaust pipes?

Identify the major product $Y$ in the following reaction sequence:
$CH_3-CH(CH_3)-CH_2-Cl$ $\xrightarrow[\text{dry ether}]{Na} X$ $\xrightarrow[\text{monobromination}]{Br_2/h\nu} Y$ (major)

The smallest compound,which on photochlorination produces diastereomers is