Which of the following is the correct order of ionisation enthalpy ? (I) \( \mathrm{Be}^{+}\math...

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Which of the following is the correct order of ionisation enthalpy ?
(I) \( \mathrm{Be}^{+}\mathrm{Be} \)
(II) \( \mathrm{Be}\mathrm{Be}^{+} \)
(III) \( \mathrm{C}\mathrm{Be} \)
(IV) \( \mathrm{B}\mathrm{Be} \)
(a) II, III
(b) III, IV
(c) I, III
(d) I, IV
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