Question

Which is the correct statement for the given acids?

Options

• Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid.

• Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.

• Both are triprotic acids.

• Both are diprotic acids.

Answer 1

Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.

Explanation:

According to the textbook, phosphinic acid (H₃PO₂) has only one ionisable -OH group, so it is monoprotic, while phosphonic acid (H₃PO₃) has two ionisable -OH groups, making it diprotic.