The structure of Wheland intermediate obtained after the attack of ${\mathrm{Br}}^{+}$ on anilinium ion is:

In the transformations

$\mathrm{PhCH}={\mathrm{CH}}_2\underset{{\mathrm{CH}}_2{\mathrm{Cl}}_2}{\overset{{\mathrm{ArCO}}_3\mathrm{H}}{\to }}\mathrm{A}\underset{2·{\mathrm{H}}_2\mathrm{O}}{\overset{1.{\mathrm{LiAH}}_4{\mathrm{Et}}_2\mathrm{O}}{\to }}\mathrm{B}$

the end product $\left(\mathrm{B}\right)$ is

How many $1,2$-shifts of carbocation intermediate are involved during the course of following reaction:

Find out total number of reagent.set of reagent used in the following conversion.

(1) ${\mathrm{H}}^{+}/\mathrm{\Delta }$

(2) conc. ${\mathrm{H}}_2{\mathrm{SO}}_4/\mathrm{\Delta }$

(3) ${\mathrm{H}}_3{\mathrm{PO}}_4/\mathrm{\Delta }$

(4) ${\mathrm{KHSO}}_4/\mathrm{\Delta }$

(5) ${\mathrm{Al}}_2{\mathrm{O}}_3/350°\mathrm{C}$

(6) ${\mathrm{PBr}}_3$

(7) ${\mathrm{SOCl}}_2$

Number of reagents that are used to convert $1$-Butyne into Butanal:

(a) $\underset{\left(2\right) {\mathrm{H}}_2{\mathrm{O}}_2/{\mathrm{OH}}^{-}}{\overset{\left(1\right) {\mathrm{BH}}_3.\mathrm{THF}}{\to }}$

(b) $\underset{\left(2\right) {\mathrm{NaBH}}_4}{\overset{\left(1\right) \mathrm{Hg}{\left(\mathrm{OAc}\right)}_2/\mathrm{THF}/{\mathrm{H}}_2\mathrm{O}}{\to }}$

(c) ${\mathrm{HgSO}}_4/\mathrm{dil}.{\mathrm{H}}_2{\mathrm{SO}}_4$

(d) ${\mathrm{O}}_3/\mathrm{Zn}$

(e) ${\mathrm{Br}}_2/{\mathrm{CCl}}_4$