Which of the following complex compound exhibits geometrical isomerism?

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$[CoCl {({NH}_{3})}_{4} (H_{2} O)]$

$[{CoCl}_{3} {({NH}_{3})}_{3}]$

$[{CoCl}_{2} {({NH}_{3})}_{4}]$

All of these

answer is D.

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Detailed Solution

All of the given complexes shows geometrical isomerism.

Cis trans isomerism is present in all three complexes. Water and chlorine ligands lie next to one another in the cis isomer of $[CoCl {({NH}_{3})}_{4} (H_{2} O)]$ They are in opposition to one another in the trans isomer. Three chlorine ligands are present on one triangle face of the $[{CoCl}_{3} {({NH}_{3})}_{3}]$ cis (or fac) isomer, whereas three ammonia ligands are present on the other triangular face. The three ammonia ligands are located on the opposing edges of the trans isomer's three ligands, which are present on the edges. Two chlorine ligands lie next to one another in the $[{CoCl}_{2} {({NH}_{3})}_{4}]$ cis isomer. They are in opposition to one another in the trans isomer.