Identify the bracketed compounds in each of the following reactions.

Benzyl alcohol$\underset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{\mathrm{conc}}{\to }}\mathrm{A}\stackrel{\mathrm{NBS}}{\to }\mathrm{B}\stackrel{\mathrm{KCN}}{\to }\mathrm{C}\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }\mathrm{D}$

Identify the bracketed compounds in each of the following reactions.

$\stackrel{{\mathrm{O}}_3/{\mathrm{H}}_2\mathrm{O}}{\to }\mathrm{A}\underset{\left(\mathrm{ii}\right){\mathrm{H}}^{+}}{\overset{\left(\mathrm{i}\right)\mathrm{HCN}}{\to }}\mathrm{B}\stackrel{\mathrm{heat}}{\to }\mathrm{C}$

Give stereochemical formula of compounds $\mathrm{A} \text{to} \mathrm{G}.$

rac- $\mathrm{\beta }$ -Bromobutyric acid $\stackrel{1 \mathrm{moleP},{\mathrm{Br}}_2}{\to }\mathrm{A}+\mathrm{B}$

Identify the compounds $\mathrm{C}$ to $\mathrm{D}$.

Maleic acid + $2-$methylbutanoic acid$⟶\mathrm{C}+\mathrm{D}$

Identify the compounds E to G

. 

Identify the product $\mathrm{P}$ in the given reactions:

 $\frac{{\mathrm{SOCl}}_2}{\left(1\right)}\frac{{\mathrm{N}}_2{\mathrm{O}}_5}{\left(2\right)}\frac{{\left({\mathrm{CH}}_3\right)}_2\mathrm{CuLi}}{\left(3\right)}\frac{\mathrm{Fe}/{\mathrm{H}}^{\oplus }}{\left(4\right)}\frac{{\mathrm{NaNO}}_2/{\mathrm{H}}^{\oplus }}{\left(5\right)}\frac{\mathrm{PhOH}/{\mathrm{OH}}^{\ominus }}{\left(6\right)}\to \left(\mathrm{P}\right)$

$30 \mathrm{g}$ of a monobasic carboxylic acid $\mathrm{A}$ consumed $0.5 \mathrm{moles}$ of $\mathrm{NaOH}$ for its neutralisation. $\mathrm{A}$ is subjected to the following treatments:

$\left[\mathrm{A}\right]\stackrel{{\mathrm{Cl}}_2/\mathrm{P}}{\to }\left(\begin{array}{l}\text{ Monochloro }\\ \text{ derivative }\end{array}\right)\underset{\mathrm{with} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\overset{\mathrm{Esterification}}{\to }}\left(\mathrm{Ester}\right)\stackrel{\mathrm{KCN} \mathrm{alc}}{\to }\left[\mathrm{B}\right]\underset{\mathrm{Acid}}{\overset{\mathrm{Hydrolysis}}{\to }}\mathrm{Dicarboxylic} \mathrm{acid}\left[\mathrm{C}\right]\underset{150°\mathrm{C}}{\overset{\mathrm{Heat}}{\to }}\mathrm{A}$

Give the structures of $\mathrm{A},\mathrm{B},\mathrm{C}$ by providing the sequence of reactions.

In the reaction sequence,

$\stackrel{\mathrm{Y}}{⟶}{\mathrm{CH}}_3\mathrm{C}\equiv \mathrm{N}\stackrel{\mathrm{Z}}{⟶}{\mathrm{CH}}_3{\mathrm{COOC}}_2{\mathrm{H}}_5$

what is $\mathrm{X},\mathrm{Y} \text{and} \mathrm{Z}$?

Pick up the major product in the following reaction.