$A$ hydrocarbon $C_5H_{12}$ does not react with chlorine in the dark but gives six monochloro compounds in bright sunlight. The hydrocarbon is:

$C.N.G$ is........

The number of tertiary carbon atoms in the compound $(CH_3)_2CHCH_2C(CH_3)_3$ is

The relative reactivity of $1^o H$,$2^o H$,and $3^o H$ in bromination reaction has been found to be $1 : 82 : 1600$ respectively. In the reaction $CH_3-CH(CH_3)-CH_3 \text{ (excess)} + Br_2$ $\xrightarrow{hv} CH_3-C(Br)(CH_3)-CH_3 \text{ (A)} + CH_3-CH(CH_3)-CH_2-Br \text{ (B)}$,the percentage yields of the products $(A)$ and $(B)$ are expected to be:

Give the name and use of the compound produced during the incomplete combustion of an alkane.

Write the structures of different chain isomers of alkanes corresponding to the molecular formula $C_{6}H_{14}$. Also,write their $IUPAC$ names.