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JEE Advanced levelSingle correct optionDifficulty 3 of 3ap051

Glycerol (propane-1,2,3-triol) is treated with excess $HIO X_{4}$ . The organic products are

A3 mol methanal
B2 mol methanal and 1 mol methanoic acid
C1 mol methanal and 2 mol methanoic acid
D1 mol methanal and 1 mol ethanal

Answer: B

The first cleavage (C1-C2) gives

HCHO

and glycolaldehyde,

HOCH X_{2} - CHO

. This still has vicinal oxygenated carbons and is cleaved further to

HCHO

and

HCOOH

. Two moles of

HIO X_{4}

are used in all, giving 2

HCHO

and 1

HCOOH

.

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