At normal temperature,iodoform is:

In $S_{N}2$ reactions,the correct order of reactivity for the following compounds:

Which of these does not form a Grignard reagent?

On monochlorination of $2-$methylbutane,the total number of chiral compounds is

Assertion : $CHCl_3$ is stored in dark bottles.
Reason : $CHCl_3$ is oxidised in dark.

In the following pairs of halogen compounds,which compound undergoes faster $S_N1$ reaction?
$(i)$ $2$-chloro-$2$-methylpropane and $3$-chloropentane
(ii) $2$-chloroheptane and $1$-chlorohexane