Identify the molecular formula of an alkane that exhibits only two different structural isomers.

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:

$A$ mixture of ethyl iodide and $n-$propyl iodide is subjected to Wurtz reaction. The hydrocarbon that will not be formed is

If the octane number of a sample of petrol is $40$,it is a mixture of........and............

Which of the following alkanes with the lowest number of carbon atoms is optically active?

Which product is obtained on heating sodium acetate with sodalime?