Assertion :In a coordination entity $[P t C l_{2} (e n)_{2}]^{2 +}$ only the cis-isomer shows optical activity. Reason: Optical isomerism is common in octahedral complexes involving didentate ligands.

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
Only cis-form will have non-superimposable mirror images. Trans isomer is optically inactive as it has mirror plane and hence symmetry.

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In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are true, reason is correct explanation of assertion.
(b) Assertion and reason both are true but reason is not the correct explanation of assertion.
(c) Assertion is true, reason is false.
(d) Assertion is false, reason is true.

Assertion (A) Complexes of $M X_{6}$ and $M X_{5} L$ type (X and L are unidentate) do not show geometrical isomerism.
Reason (R) Geometrical isomerism is not shown by complexes of coordination number 6.

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst.

Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :In a coordination entity [PtCl2(en)2]2+ only the cis-isomer shows optical activity. Reason: Optical isomerism is common in octahedral complexes involving didentate ligands.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionOnly cis-form will have non-superimposable mirror images. Trans isomer is optically inactive as it has mirror plane and hence symmetry.

Assertion :In a coordination entity $[P t C l_{2} (e n)_{2}]^{2 +}$ only the cis-isomer shows optical activity. Reason: Optical isomerism is common in octahedral complexes involving didentate ligands.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Only cis-form will have non-superimposable mirror images. Trans isomer is optically inactive as it has mirror plane and hence symmetry.