Arrange the following reactants in increasing order of reactivity towards $S_{N^1}$ solvolysis reaction with methanol.

Which of the following statements is incorrect?

Match the reactants in Column-$(I)$ with the products formed in Column-$(II)$.

Column-$(I)$ (Reactants)	Column-$(II)$ (Major Products)
$(A)$ $C_6H_5CH_3 + X_2 \xrightarrow{Fe, \text{dark}}$	$(i)$ $C_6H_5CH(Br)CH_3$
$(B)$ $C_6H_5NH_2 \xrightarrow{NaNO_2, HX, 273-278 \ K}$	$(ii)$ $C_6H_5N_2^+X^-$
$(C)$ $C_6H_5N_2^+X^- \xrightarrow{Cu_2X_2}$	$(iii)$ $p-X-C_6H_4CH_3 + o-X-C_6H_4CH_3$
$(D)$ $C_6H_5CH_2CH_3 \xrightarrow{Br_2, \Delta \text{ or } UV \text{ light}}$	$(iv)$ $C_6H_5X$

Product $A$ is

Given below are four compounds:
$(a)$ $n$-propyl chloride,
$(b)$ $iso$-propyl chloride,
$(c)$ $sec$-butyl chloride,
$(d)$ $neo$-pentyl chloride.
Percentage of carbon in the one which exhibits optical isomerism is:

Match the reactions given in Column-$I$ with their names in Column-$II$:

Column-$I$ (Reactants)	Column-$II$ (Name)
$A$. $R-X + NaI \xrightarrow{\text{dry acetone}} R-I + NaX$	$i$. Electrophilic addition
$B$. $H_3C-Br + AgF \to H_3C-F + AgBr$	$ii$. Finkelstein reaction
$C$. $H_3C-CH_3 + Cl_2 \xrightarrow{hv} H_3C-CH_2Cl + HCl$	$iii$. Swarts reaction
$D$. $CH_2=CH_2 + Br_2 \to BrCH_2-CH_2Br$	$iv$. Free radical substitution