Assertion :The complex ion $[C o (e n)_{2} B r_{2}]^{-}$ has three stereoisomers. Reason: The complex ion $[C o (e n)_{2} B r_{2}]^{-}$ has an octahedral geometry.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The hybridization in $[C o (e n)_{2} B r_{2}]^{-}$ is $d^{2} s p^{3}$ and octahedral geometry. But the correct reason for the complex to have three stereo|somers is that the cis-isomer can exist in two optically active forms (enantiomers) as shown.

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Assertion :The complex ion [Co(en)2Br2]− has three stereoisomers. Reason: The complex ion [Co(en)2Br2]− has an octahedral geometry.

Assertion :The complex ion $[C o (e n)_{2} B r_{2}]^{-}$ has three stereoisomers. Reason: The complex ion $[C o (e n)_{2} B r_{2}]^{-}$ has an octahedral geometry.