In which of the following carbohydrates does | vedclass

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(A) In an acetylation reaction,the $H$ atom of an $(-OH)$ group is replaced by an acetyl group $(-COCH_3)$.This results in an increase in molecular ma

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Aldotriose

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(A) In an acetylation reaction,the $H$ atom of an $(-OH)$ group is replaced by an acetyl group $(-COCH_3)$.This results in an increase in molecular mass by $[(12+16+12+3 	imes 1)-1] = 42 \ u$ per $-OH$ group.Given the total increase in molecular mass is $84 \ u$.Therefore,the number of $-OH$ groups $= \frac{84 \ u}{42 \ u} = 2$.Among the given options,an aldotriose (e.g.,glyceraldehyde) contains two alcoholic $-OH$ groups,which upon acetylation will increase the molecular mass by $2 	imes 42 \ u = 84 \ u$.

In which of the following carbohydrates does the molecular mass increase by $84 \ u$ after complete acetylation?

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