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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc161

Which of the following octahedral complex ions are optically active? One or more options may be correct (en = symmetrical bidentate; $EDTA X^{4 -}$ = hexadentate).

A $[Cr (ox) X_{3}] X^{3 -}$
Btrans- $[Co (en) X_{2} (NH X_{3}) Cl] X^{2 +}$
C $[Co (EDTA)] X^{-}$
Dcis- $[Co (en) X_{2} (NH X_{3}) Cl] X^{2 +}$

Answer: A, C, D

Tris-chelates such as

[Cr (ox) X_{3}] X^{3 -}

are chiral propellers.

[Co (EDTA)] X^{-}

wraps around the metal asymmetrically and is chiral. cis-

M (AA) X_{2} bc

is chiral, but in the trans isomer the mirror plane containing b, c and the metal makes it inactive.

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