Which compound is not a monobasic acid ?

Why boric acid is a monobasic acid ?

Select the correct word or formula from the same give in bracket : The acid which is not a monobasic acid .[Acetic/Sulphurous/Hydrochloric /Nitric/Formic acid]

How will you show that acetic acid is a monobasic acid ?

Hydrochloric acid is a monobasic acid.

Orthoboric acid is a monobasic acid because -

Orthophosphorous acid is a tribasic acid but hypophosphoric acid is a monobasic acid - Explain.