Which of the following is a nucleophilic addition reaction?

The polymer shown in the image is obtained when a carbon compound is allowed to stand. It is a white solid. The polymer is:

Which of the following reactions are incorrect?
$(a)$ $CH_2(COOH)_2 \xrightarrow{\Delta} CH_3COOH + CO_2$
$(b)$ Aniline $\xrightarrow{CH_3Cl/AlCl_3}$ $p$-chloroaniline
$(c)$ Phenol $\xrightarrow{CHCl_3 + aq. NaOH}$ Salicylic acid
$(d)$ $CH_3CHO + NaHSO_3 \rightleftharpoons CH_3CH(OH)SO_3Na$
$(e)$ Benzene $\xrightarrow{CO, HCl, Anhydrous AlCl_3/CuCl}$ Benzaldehyde

Which of the following does not give a stable product with water?

Acetone on treatment with $CH_3MgI$ and on further hydrolysis gives:

In the reaction,$[X]$ will be: