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The compound [Co(NH3)5(NO2)](NO3)2 does not show _________ isomerism.

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in Chemistry – Class 12 by (188k points)
The compound [Co(NH3)5(NO2)](NO3)2 does not show _________ isomerism.

(a) coordination

(b) optical

(c) ionisation

(d) linkage

This question was addressed to me during an interview.

Question is taken from Isomerism in Coordination Compounds in portion Coordination Compounds of Chemistry – Class 12

2 Answers

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Right choice is (a) coordination

The best explanation: There is only one complex ion and there is no possibility of a coordination isomer. The ionisation isomer is [Co(NH3)5(NO3)](NO3)(NO2) and the linkage isomer is [Co(NH3)5(ONO)](NO3)2.
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The correct answer should be optical because [Co(NH3)5(NO2)](NO3)2  has five ammonia ligands attached to the central Cobalt ion. Its mirror image is superimposable on the real, so it won't have any optical isomer. 

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