Assertion :Oxidation number of carbon in HCN is $+ 2$ . Reason: Carbon always shows an oxidation state of $+ 4$ .

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
Nitrogen is more electronegative than carbon so it has +3 oxidation state as there is triple bond in between them and it is more electronegative than hydrogen so it has (+3-1=+2) oxidation state.
Carbon can vary its oxidation state from -4 to +4.
Assertion is correct but reason is incorrect.

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Assertion :Oxidation number of carbon in HCN is +2. Reason: Carbon always shows an oxidation state of +4.

Assertion :Oxidation number of carbon in HCN is $+ 2$ . Reason: Carbon always shows an oxidation state of $+ 4$ .