The reaction ${C_2H_5Cl} \xrightarrow{[H]} x$ produces $x$ as:

Consider the isomers of the hydrocarbon with molecular formula $C_5H_{10}$. These isomers do not decolourise $KMnO_4$ solution. These isomers are subjected to chlorination with chlorine in the presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed from all these isomers is . . . . . . .

$CH_3-CH_2-CH_2-CH_3 \xrightarrow[\Delta]{AlCl_3} CH_3-CH(CH_3)-CH_3$
The above reaction is an example of:

$CH_3-CH(CH_3)-CH_3 + CH_2=CH_2 \xrightarrow[2.5^oC]{HF} (A)$; $(A)$ is:

What is the molecular formula of undecane?

The chemical added to petrol to prevent the deposition of lead in the combustion chamber is ............... .