Assertion :The first IE of Be is greater than that of B. Reason: 2p orbital is lower in energy than 2s.

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
Electronic configuration:
$B e = 1 s^{2} 2 s^{2}$
$B = 1 s^{2} 2 s^{2} 2 p^{1}$
Because of fulfilled s-orbital configuration, the first IE of Be is greater than that of B and the energy of 2s orbital is less than that of 2p.

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Assertion :The first IE of Be is greater than that of B. Reason: 2p orbital is lower in energy than 2s.

The correct option is C Assertion is correct but Reason is incorrectElectronic configuration:Be=1s22s2B=1s22s22p1Because of fulfilled s-orbital configuration, the first IE of Be is greater than that of B and the energy of 2s orbital is less than that of 2p.

The correct option is C Assertion is correct but Reason is incorrect
Electronic configuration:
$B e = 1 s^{2} 2 s^{2}$
$B = 1 s^{2} 2 s^{2} 2 p^{1}$
Because of fulfilled s-orbital configuration, the first IE of Be is greater than that of B and the energy of 2s orbital is less than that of 2p.