Which of the following is a correct reaction?

Which metal catalyzed reaction would release the maximum amount of heat per $CH_2$ unit?

Which of the following shows only one monobrominated compound upon reaction with $Br_2$ in the presence of light?

The reactions which produce alcohol as the product are:
$A$. $CH_{4} + O_{2} \xrightarrow{Mo_{2}O_{3}}$
$B$. $2CH_{3}CH_{3} + 3O_{2} \xrightarrow[\Delta]{(CH_{3}COO)_{2}Mn}$
$C$. $(CH_{3})_{3}CH \xrightarrow{KMnO_{4}}$
$D$. $2CH_{4} + O_{2} \xrightarrow{Cu/523 \ K/100 \ atm.}$
$E$. $CH_{3}CH=CHCH_{3} \xrightarrow{KMnO_{4}/H^{+}}$
Choose the correct answer from the options given below:

Write the reaction for the preparation of ethane from the following:
$(i)$ Ethene
$(ii)$ Ethyl chloride

Propane is obtained from propene,by which of the following methods?