Which of the following pentoses will be optic | vedclass

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(A) Aldopentoses have the general formula $CHO-(CHOH)_3-CH_2OH$. Since the two ends of the molecule ($CHO$ and $CH_2OH$ groups) are different,there is

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(A) Aldopentoses have the general formula $CHO-(CHOH)_3-CH_2OH$. Since the two ends of the molecule ($CHO$ and $CH_2OH$ groups) are different,there is no possibility of a plane of symmetry in the open-chain structure. Thus,all stereoisomers of aldopentoses are chiral and optically active. Therefore,$I$,$II$,and $III$ are all optically active.

Which of the following pentoses will be optically active?
$I$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$
$II$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$
$III$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$

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Which of the following pentoses will be optically active? $I$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$ $II$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$ $III$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$