Question

In hypophosphorus acid the number of hydroxyl groups present are :

• A. 5
• B. 1
• C. 3
• D. 7

Answer 1

Answer: (B)

Hypophosphorus acid is ${\text{H}}_{\text{3}}\text{P}{\text{O}}_{\text{2}}$ and its structure is
so, ${\text{H}}_{\text{3}}\text{P}{\text{O}}_{\text{2}}$ has only one hydroxyl group.