In the given reaction,
$Cyclohexanone \xrightarrow[(ii) \text{ heat}]{(i) \text{ } OH^-} 'P'$
The number of $\pi$ electrons present in the product $'P'$ is $....$

Compound $(A)$ with molecular formula $C_6H_{12}O_3$ gives a positive iodoform test and a negative Tollens' test. Upon treatment with water and a drop of $H_2SO_4$,it gives a positive Tollens' test. Compound $(A)$ is:

$Propyne$ $\xrightarrow[Hg^{2+} / H_2 O, \Delta]{H^{+}}$ $P$ $\stackrel{Ba(OH)_2}{\rightleftharpoons}$ $Q$ $\xrightarrow{\Delta}$ $R$. $R$ in the above sequence of reactions is:

$A$ mixture of $PhCHO$ and $HCHO$ is treated with $NaOH$. Which of the following processes occur during the Cannizzaro reaction?

Consider the following reaction sequence:
$(CH_3)_2C=CH_2 \xrightarrow[\text{(2) } Zn/H_2O]{\text{(1) } O_3} X + Y$
$X + Y \xrightarrow[\text{(2) } \Delta]{\text{(1) dil. } NaOH} Z$
The $IUPAC$ name of '$Z$' is

Benzophenone does not react with: