Assertion :In radioactive disintegrations, $_{2} {H e}^{4}$ nuclei can come out of the nucleus but lighter $_{2} {H e}^{3}$ can't. Reason: Binding energy of $_{2} {H e}^{3}$ is more than that of $_{2} {H e}^{4}$ .

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
$α$ particle emission from the nucleus allows on $α ({H e}_{2}^{4})$ particles to come out.
Binding energy of ${H e}_{2}^{3}$ is lower than ${H e}_{2}^{4}$ so the reason is incorrect.

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