Assertion :Carbon has coordination number $(C . N .)$ of four while other elements of this group have $C . N .$ of six. Reason: Due to available $d$ -orbital in which $(n - 1) p$ electrons.can be excited to make $C . N .$ of six. Carbon lacks $d -$ orbital.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Carbon has coordination number $(C . N .)$ of four while other elements of this group have $C . N .$ of six.Due to available $d$ -orbital in which $(n - 1) p$ electrons.can be excited to make $C . N .$ of six. Carbon lacks $d -$ orbital.
So Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hence option A is correct.

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Assertion :Carbon has coordination number (C.N.) of four while other elements of this group have C.N. of six. Reason: Due to available d-orbital in which (n−1)p electrons.can be excited to make C.N. of six. Carbon lacks d−orbital.

Assertion :Carbon has coordination number $(C . N .)$ of four while other elements of this group have $C . N .$ of six. Reason: Due to available $d$ -orbital in which $(n - 1) p$ electrons.can be excited to make $C . N .$ of six. Carbon lacks $d -$ orbital.