Which of the following pair of compound name - formula is correct?

I. Hydrogen chloride - $H_2Cl$

II. Hydrogen sulphide - $HS_2$

Neither I nor II

The correct answer is option 2. Neither I nor II.

I. Hydrogen chloride - \(H_2Cl\):

While "Hydrogen chloride" is indeed the correct name, the formula should be HCl. Each molecule consists of one hydrogen atom (H) and one chlorine atom (Cl).

II. Hydrogen sulphide - \(HS_2\):

Both the name and formula are incorrect. The correct name is hydrogen sulfide, and the correct formula is H₂S. There are two hydrogen atoms (H₂) and one sulfur atom (S) in each molecule.

Therefore, neither option I nor II has the correct pair of names and formula.