Identify $X$ and $Y$ in the following reaction scheme:

The relative acidic strengths of benzoic acid,$o-$toluic acid and $p-$toluic acid are in the decreasing order:

Find the main product of the following reaction:

Which of the following is not correct?

Identify the incorrect statement regarding acetic acid.

The product $(D)$ in the following reaction sequence is: $HOCH_2CH_2CH_2COOCH_2CH_3$ $\xrightarrow{PCC} (A)$ $\xrightarrow[{(1 \ molar \ equivalent)}]{H_2C=CHMgBr} (B)$ $\xrightarrow{NH_4Cl/H_2O} (C)$ $\xrightarrow[H_2O]{KOH}$ $\xrightarrow{H_3O^{+}}$ $\xrightarrow[pyridine]{(CH_3CO)_2O} (D)$