The incorrect statement is

MCQ

A
The second ionisation energy of $Se$ is greater than that of second ionisation energy of $As$
B
The first ionisation energy of $C^{2+}$ ion is greater than that of first ionisation energy of $N^{2+}$ ion
C
The third ionisation energy of, $F$ is greater than that of third ionisation energy of $O$
✓
Helogens have highest $I.E.$ in respective period

✓

Answer

Correct option: D.

Helogens have highest $I.E.$ in respective period

d
$(a)\,\mathop {Se}\limits_{4{p^4}} \xrightarrow{{I.E{._1}}}\mathop {S{e^ + }}\limits_{4{p^3}} \xrightarrow{{I.E{._2}}}\mathop {S{e^{2 + }}}\limits_{4{p^2}} $ $\mathop {As}\limits_{4{p^3}} \xrightarrow{{I.E{._1}}}\mathop {A{s^ + }}\limits_{4{p^2}} \xrightarrow{{I.E{._2}}}\mathop {A{s^{2 + }}}\limits_{4{p^1}} $

$(b)\,\mathop C\limits_{2{p^2}} \to \mathop {{C^ + }}\limits_{2{p^1}} \to C_{2{s^2}}^{2 + }$ $\mathop N\limits_{2{p^3}} \to \mathop {{N^ + }}\limits_{2{p^2}} \to \mathop {{N^{2 + }}}\limits_{2{p^1}} $ $\mathop O\limits_{2{p^4}} \to \mathop {{O^ + }}\limits_{2{p^3}} \to \mathop {{O^{2 + }}}\limits_{2{p^2}} $

$(c)\,\mathop F\limits_{2{p^5}} \xrightarrow{{I.E{._1}}}\mathop {{F^ + }}\limits_{2{p^4}} \xrightarrow{{I.E{._2}}}\mathop {{F^{2 + }}}\limits_{2{p^3}} \xrightarrow{{I.E{._3}}}{F^{3 + }}$ $\mathop O\limits_{2{p^4}} \xrightarrow{{I.E{._1}}}\mathop {{O^ + }}\limits_{2{p^3}} \xrightarrow{{I.E{._2}}}\mathop {{O^{2 + }}}\limits_{2{p^2}} \xrightarrow{{I.E{._3}}}{O^{3 + }}$

$(d)$ In respective period, noble gases have highest $I.E.$