Which of the following is $NOT$ formed when a mixture of methyl bromide and $n$-propyl bromide is treated with sodium metal in dry ether?

What is the bond length of the $C-C$ bond in an alkane where all carbon atoms are $sp^{3}$ hybridized (in $pm$)?

Halogenation of alkanes is an example of which mechanism?

When vegetation is burnt in the absence of oxygen,which of the following will be formed?

Which one of the following compounds does not decolourize bromine water?

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: