Which of the following will have three stereo isomeric forms?
(i) $[C r {(N O_{3})}_{3} {(N H_{3})}_{3}]$ (ii) $K_{3} [C o {(C_{2} O_{4})}_{3}]$
(iii) $K_{3} [C o C l_{2} {(C_{2} O_{4})}_{2}]$ (iv) $[C o B r C l {(e n)}_{2}]$

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(iii) and (iv)

All four

(i), (iii) and (iv)

(iv) only

answer is A.

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Detailed Solution

The compound $[C r {(N O_{3})}_{3} {(N H_{3})}_{3}]$ has two stereoisomers fac and mer-isomers. Both are optically inactive
The compound $K_{3} [F e {(C_{2} O_{4})}_{3}]$ has two stereoisomers. Both are optically active One is d from and the other is 1 form
The compound $[C o B r C l {(e n)}_{2}]$ has three stereisomers. Two are geometrical isomers c is and trans.
The c is isomer has two optical isomers d from and $l$ from
Trans isomer is meso in nature
The compound ${[C o C l_{2} {(O x)}_{2}]}^{3 -}$ has three stereoisomers.Two are geometrical isomers c is and trans.
The c is isomer has two optical isomers d from and $l$ from
Trans isomer is meso in nature