Which one of the following compounds gives methane on treatment with water?

$CH_3-CH_2-CH_2-CH_3 \xrightarrow[HBr]{AlCl_3}$ Product in the above reaction is:

$A$ fuel has the same knocking property as a mixture of $70\%$ isooctane and $30\%$ $n$-heptane. The octane number of the fuel is .............

The number of possible monobromo products for the reaction of methylcyclohexane with $Br_2/hv$ is (excluding stereoisomers):

Identify the correct catalyst and reaction conditions for the controlled oxidation of methane to $(i)$ methanol $(X)$, $(ii)$ methanal $(Y)$ and ethane to $(iii)$ ethanoic acid $(Z)$.

Which of the following reactions is expected to give a good yield of hydrocarbon?