Assertion : The first ionization energy of $L i$ is less than that of $N a$
Reason : $L i$ is a smaller atom than $N a$

Both assertion and reason are correct and reason is the correct explanation for assertion.

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Both assertion and reason are correct and reason is not the correct explanation for assertion.

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Assertion is correct but reason is incorrect.

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Assertion is incorrect but reason is correct.

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Both assertion and reason are incorrect.

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Solution

The correct option is D Assertion is incorrect but reason is correct.
$L i$ is a smaller atom than $N a$ . Hence, the attraction of nucleus for valence electrons in $L i$ is greater than in $N a$ . Thus $L i$ has higher first ionization energy than nucleus.

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Assertion : The first ionization energy of Li is less than that of NaReason : Li is a smaller atom than Na

The correct option is D Assertion is incorrect but reason is correct.Li is a smaller atom than Na. Hence, the attraction of nucleus for valence electrons in Li is greater than in Na. Thus Li has higher first ionization energy than nucleus.

Assertion : The first ionization energy of $L i$ is less than that of $N a$
Reason : $L i$ is a smaller atom than $N a$

The correct option is D Assertion is incorrect but reason is correct.
$L i$ is a smaller atom than $N a$ . Hence, the attraction of nucleus for valence electrons in $L i$ is greater than in $N a$ . Thus $L i$ has higher first ionization energy than nucleus.