$C_2H_5MgI$ reacts with $HCHO$ to form the final product.

Which reaction will give $CH_3-CH(CH_3)-CH(OH)-CH_3$ as a major product?

Ethyl magnesium bromide reacts with acetone to give $X$. On hydrolysis,$X$ forms:

Which of the following alcohols cannot be prepared from the hydration of an alkene?

What are $X$ and $Y$ in the following reactions?
$CH_2O \xrightarrow[(ii) H_3O^+]{(i) X} CH_3(CH_2)_2CH_2OH$
$Y \xrightarrow[(ii) H_3O^+]{(i) C_2H_5MgBr} CH_3CH_2C(CH_3)_2OH$

$RMgX \xrightarrow{HCHO} CH_3-CH(CH_3)-CH_2-OH$. Find out $R$ in this reaction.