Which of the following pentoses exhibit optic | vedclass

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(A) Optical activity in organic molecules is exhibited by compounds that possess at least one chiral carbon atom and lack a plane of symmetry (i.e.,th

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All of these

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(A) Optical activity in organic molecules is exhibited by compounds that possess at least one chiral carbon atom and lack a plane of symmetry (i.e.,they are chiral).All three structures provided ($I$: Ribose,$II$: Arabinose,$III$: Xylose) are aldopentoses with the general formula $CHO-(CHOH)_3-CH_2OH$.In these molecules,the carbons at positions $2$,$3$,and $4$ are chiral centers because they are bonded to four different groups.Since these molecules contain chiral centers and do not have an internal plane of symmetry,they are optically active.Therefore,all three pentoses exhibit optical activity.

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$I$. $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$	$II$. $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$
$III$. $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$