The products $C$ and $D$ are given by the following reaction sequence:
$CH_3CH_2COCH_3$ $\xrightarrow[(ii) H_3O^+]{(i) CH_3MgBr} A$ $\xrightarrow[358 \ K]{20\% H_3PO_4} B \text{ (Major)}$ $\xrightarrow[(ii) Zn/H_2O]{(i) O_3} C + D$

What will be the product $B$ in the following sequence of reactions?
$HC \equiv CH$ $\xrightarrow{30\% \, H_2SO_4, \, HgSO_4} A$ $\xrightarrow{NaOH} B$

Write down functional isomers of a carbonyl compound with molecular formula $C_3H_6O$. Which isomer will react faster with $HCN$ and why? Explain the mechanism of the reaction also. Will the reaction lead to the completion with the conversion of whole reactant into product at reaction conditions? If a strong acid is added to the reaction mixture what will be the effect on concentration of the product and why?

Which of the following is incorrect for $Acetophenone$?

The structure of $(B)$ is

Which among the following is a possible product during cross aldol condensation between propanal (as electrophile) and butanal (as nucleophile)?