Final product (B) obtained in the following sequence of reactions is

${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{CH}}_2-\mathrm{CN}\underset{\left(\mathrm{ii}\right){\mathrm{H}}_2\mathrm{O}}{\overset{\left(\mathrm{i}\right) \mathrm{DIBAL} -\mathrm{H}}{\to }}\mathrm{A}\underset{\left(\mathrm{ii}\right)\mathrm{KOH}/\mathrm{\Delta }}{\overset{\left(\mathrm{i}\right) {\mathrm{NH}}_2{\mathrm{NH}}_2}{\to }}\mathrm{B}$

Which of the following pairs can be distinguished by Fehling test?

Product obtained in the following reaction is called

Product (C) obtained in the following sequence of reaction is

Consider the following reactions

a. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}\stackrel{\mathrm{Cu}(573 \mathrm{K})}{⟶}\mathrm{A}$

b. ${\mathrm{CH}}_3-\mathrm{CH}\left(\mathrm{OH}\right)-{\mathrm{C}}_2{\mathrm{H}}_5\stackrel{\mathrm{Cu}(573 \mathrm{K})}{⟶}\mathrm{B}$

Products $\mathrm{A}$ and $\mathrm{B}$ respectively are

Number of optically active products formed in following reaction is

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CHO}+\mathrm{HCN}\underset{(\mathrm{ii}) {\mathrm{H}}^{+}}{\overset{(\mathrm{i}) {\mathrm{OH}}^{-}}{\to }}$