Iodoethane reacts with sodium in the presence of dry ether. The product is

In the given pairs of reactions,in which pair is the second reaction more reactive than the first toward $S_{N}2$ reaction?

What is the product of the following $S_N2$ reaction?

The correct order for increasing reactivity towards $S_N1$ substitution for the following compounds is:
$1. CH_3CH_2Br$
$2. CH_2=CHCH(Br)CH_3$
$3. CH_2=CHBr$
$4. CH_3CH(Br)CH_3$

Which of the following is a chiral molecule?

Chloroform is stored in dark-colored bottles in the presence of $:-$