The correct statement on the isomerism associated with the following complex ions (a) [ Ni(H _2 O) _5 NH _3]^ 2+ , (b) [ Ni(H _2 O) _4( NH _3)_2]^ 2+ and (c) [ Ni(H _2 O) _3( NH _3)_3]^ 2+ is:

JEE Main 2015 Chemistry question

The correct statement on the isomerism associated with the following complex ions (a) , (b) and (c) is:

(1)(a) and (b) show only geometrical isomerism
(2)(a) and (b) show geometrical and optical isomerism
(3)(b) and (c) show geometrical and optical isomerism
(4)(b) and (c) show only geometrical isomerismCorrect

Answer: (4)

Solution

All three are octahedral. (a) is of the type : all five A positions are equivalent, so there is only one structure and *no* isomerism at all — this immediately eliminates options (1) and (2). (b) is , which exists as *cis* and *trans* geometrical isomers; (c) is

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Question ID VK-115277