JEE Advanced Chemistry question

Of the following acids I. Hypophosphorous acid II. Oxalic acid III. Glycine

(A)I, II are monobasic, III dibasic and amphoteric
(B)II monobasic, I dibasic acid, III amphoteric
(C)I monobasic, II dibasic, III amphotericCorrect
(D)I, II dibasic, III amphoteric

Answer: (C)

Solution

Hypophosphorous acid, H3PO2, has the structure H2P(=O)(OH): despite the formula showing 3 hydrogens, only the single O–H hydrogen is ionisable (the two P–H hydrogens are not acidic), making it monobasic (H3PO2 ⇌ H⁺ +

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Question ID VK-159412