Assertion :Activating groups are electron donors. Reason: Nitroso group is activating group.

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 C Assertion is correct but Reason is incorrect
Like halogens, the nitroso group $(- N = O)$ is also deactivating but o, p-directing. It is deactivating because $O$ is more electronegative than $N$ and hence $N O$ group as whole with draws electrons from the benzene ring.

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Assertion :Activating groups are electron donors. Reason: Nitroso group is activating group.

The correct option is C Assertion is correct but Reason is incorrectLike halogens, the nitroso group (−N=O) is also deactivating but o, p-directing. It is deactivating because O is more electronegative than N and hence NO group as whole with draws electrons from the benzene ring.

The correct option is C Assertion is correct but Reason is incorrect
Like halogens, the nitroso group $(- N = O)$ is also deactivating but o, p-directing. It is deactivating because $O$ is more electronegative than $N$ and hence $N O$ group as whole with draws electrons from the benzene ring.