Among the following which are the total number of complexes that are optically active?
(i) ${[C r {(O x)}_{3}]}^{3 -}$ (ii) $c i s - [P t (C l_{2}) (e n)]$
(iii) $c i s - {[R h (C l_{2}) {(N H_{3})}_{4}]}^{+}$ (iv) ${[R u {(d i p y)}_{3}]}^{3 +}$
( v) $c i s - [C o {(N O_{2})}_{3} (d i e n)]$ (vi) $T r a n s - [C o {(N O_{2})}_{3} (d i e n)]$
(vii) $c i s - [C o {(N O_{2})}_{3} {(N H_{3})}_{3}]$

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answer is 2.

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Detailed Solution

(i) ${[C r {(o x)}_{3}]}^{3 -} :$ optically active.
(ii) $c i s - [P t (C l_{2}) (e n)] :$ optically inactive
(iii) $c i s - [R h (C l_{2}) {(N H_{3})}_{4}] :$ optically inactive
(iv) ${[R u {(d i p y)}_{3}]}^{3 +} :$ optically active
(v) $c i s - [C o {(N O_{2})}_{3} (d i e n)] :$ optically inactive
(vi) Trans $- [C o {(N O_{2})}_{3} (d i e n)] :$ optically inactive
(vii) $c i s - [C o {(N O_{2})}_{3} {(N H_{3})}_{3}] :$ optically inactive
Total number of optically active complexes = 2