Which of the following gases when passed through warm dilute solution of H2SO4 in presence of HgSO4 gives acetaldehyde?

Which of the following gases when passed through warm dilute solution

1.	Which of the following gases when passed through warm dilute solution of H₂SO₄ in presence of HgSO₄ gives acetaldehyde?
A.	CH<sub>4</sub>
B.	C<sub>2</sub>H<sub>6</sub>
C.	C<sub>2</sub>H<sub>4</sub>
D.	C<sub>2</sub>H<sub>2</sub>
Answer» E.