Nitrochloroform (Chloropicrin) is prepared by the action of chloroform and:

Compound $A$ with molecular formula $C_4H_9Br$ is treated with aqueous $KOH$ solution. The rate of this reaction depends upon the concentration of compound $A$ only. When another optically active isomer $B$ of this compound was treated with aqueous $KOH$ solution,the rate of reaction was found to be dependent on the concentration of both the compound and $KOH$.
$(i)$ Write down the structural formula of both compounds $A$ and $B$.
$(ii)$ Out of these two compounds,which one will be converted to the product with inverted configuration?

The following reaction,$(CH_3)_3CBr + H_2O \rightarrow (CH_3)_3COH + HBr$,is an example of:

The following bimolecular elimination reaction $(E_2)$ is carried out with different halogen leaving groups. The per cent yield of the two products ($2$-hexene and $1$-hexene) for each leaving group is listed below.

Leaving group	Conj. Acid $pK_a$	$\%$-yield of $2$-hexene	$\%$-yield of $1$-hexene
$X = I$	$-10$	$81\%$	$19\%$
$X = Br$	$-9$	$72\%$	$28\%$
$X = Cl$	$-7$	$67\%$	$33\%$
$X = F$	$3.2$	$30\%$	$70\%$

Which of the following statement$(s)$ is/are true concerning this series of $E_2$ reactions?

Arrange each set of compounds in order of increasing boiling points.
$(i)$ Bromomethane,Bromoform,Chloromethane,Dibromomethane.
$(ii)$ $1-$Chloropropane,Isopropyl chloride,$1-$Chlorobutane.

Identify the product of the following reaction:
(See image for reaction scheme)
Product; The product is: