In the following reaction, what is X, ${\mathrm{C}}_2{\mathrm{H}}_2\underset{{\mathrm{HgSo}}_4,{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{{\mathrm{H}}_2\mathrm{O},60°\mathrm{C}}{\to }}\mathrm{X}\iff {\mathrm{CH}}_3\mathrm{CHO}$.

In X the Oxygen is attached to s^xp^y carbon. The value of p is

: Addition of water: Acetylene gas is passed through dilute sulphuric acid at 60 – 65°C in presence of mercuric sulphate as a catalyst, a water molecule adds up and finally acetaldehyde is formed.

$\mathrm{CH}\equiv \mathrm{CH}+\mathrm{HOH}\underset{60°\mathrm{C},1\%{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{30-40\%{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\left[{\mathrm{CH}}_2=\mathrm{CHOH}\right]+{\mathrm{CH}}_3-\mathrm{CHO}$

The carbon is sp2