The given reaction
$C_6H_5-CHO + Br-CH_2-COOC_2H_5 \xrightarrow[(ii) HOH/NH_4Cl, (iii) \Delta]{(i) Zn} C_6H_5-CH=CH-COOC_2H_5$
is known as:

$A$ compound $A$ with molecular formula $C_{10}H_{13}Cl$ gives a white precipitate on adding silver nitrate solution. $A$ on reacting with alcoholic $KOH$ gives compound $B$ as the main product. $B$ on ozonolysis gives $C$ and $D$. $C$ gives Cannizzaro reaction but not aldol condensation. $D$ gives aldol condensation but not Cannizzaro reaction. $A$ is:

In the given reaction,the number of chiral carbon$(s)$ in product $A$ is .......
(Where $Et$ is $-C_2H_5$)

$NaOH/H^{+}$ reacts with:

$R$ formed in the following sequence of reaction is:

What is the characteristic odor of nitrobenzene?