Paraffin wax is

In the bromination of isobutane,the relative reactivity rates of $1^oH, 2^oH,$ and $3^oH$ are $1 : 82 : 1600$ respectively. Calculate the percentage yield of products $(a)$ and $(b)$ in the following reaction:
$CH_3-CH(CH_3)-CH_3 (excess) + Br_2 \xrightarrow{hv} (a) CH_3-C(Br)(CH_3)-CH_3 + (b) CH_3-CH(CH_3)-CH_2Br$

Which of the following conditions will give the maximum yield of $C_2H_5Cl$?

$\dot{Cl} + CH_4 \rightarrow A + B$
$A$ and $B$ in the above atmospheric reaction step are.

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

When cyclohexane is added to water,it floats because: