Consider the reaction sequence

$$ \text { Dimethyl ketone } \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{CH}_3 \mathrm{MgCl}} X \xrightarrow[\text { (ii) } \mathrm{CH}_3 \mathrm{Br}]{\text { (i) } \mathrm{Na}} Y $$

How many $s p^3$ carbons are present in $Y$ ?

Which of the following represents Etard reaction?

The correct statement about the product of the following reaction is

$$ \mathrm{CH}_3 \mathrm{CHO} \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{C}_2 \mathrm{H}_5 \mathrm{MgBr}} \text { product } $$

A carbonyl compound $X\left(\mathrm{C}_8 \mathrm{H}_8 \mathrm{O}\right)$ gives yellow precipitate with NaOI .

Hemiacetal of $X$ with methanol/dry HCl is