The incorrect statement among the following

Answer: B::C::DSolution: (a) Correct statement: In a period, element of 2nd group has higher first ionisation potential than element of group 13.
(b) Incorrect statement : $M{g}^{+}$ require less energy for further ionisation than $N{a}^{+}$ because of noble gas configuration of $N{a}^{+}$
(c) Correct statement: Ionisation energy increases from left to right in a period.
(d) Correct statement $M{g}^{2+}$ has noble gas configuration, require greater energy for further ionisation than $N{a}^{2+}$