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Q. Which of the following order is incorrect?
(a) $ NH_{3}<\, PH_{3 }<\, AsH_{3}$ Acidic character
(b) $ Li <\, Be <\, B <\, C$ First ionisation energy
(c) $Al_{2}O_{3} < \,MgO <\,Na_{2}O <\, K_{2}O$ Basic character
(d) $ Li^{+} < \,Na^{+}<\,K^{+} <\, Cs^{+}$ Ionic character

Classification of Elements and Periodicity in Properties

Solution:

$IE_{\left(Be\right)}>IE_{\left(B\right)}$ Thus, $ Li < B < Be < C $ is the order of first ionisation energy