Select the incorrect statement.

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IE1 of C2+>IE1 of N2+

IE2 of Se>IE2 of As

IE3 of F>IE3 of O

Halogens have highest IE in respective period

answer is D.

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Detailed Solution

(1)C2s22p2⟶E1C⊕2s22p1⟶IE2C2+2s22p0⟶C3+2s1N2P3→N+→N +22P1C2+→C3+, requires high energy, as d has to be removed from stable 2s2 configuration than N2+→N+3 since in this casee- is removed from 2p orbital to acquire stable configuration. (2) Se⟶IE14p4Se⊕4p3⟶IE2Se2+4p2IE2 is very high since e- has to be removed from stable p3 configuration.As4p3⟶IE1As⊕4p2⟶IE2As2+4p1IE2 is not high in comparison to IE2 of Se, since e- can be removed easily from not so stable 4p2 configuration. (3) F2p5⟶IE1F⊕2p4⟶IE2F2p3+2⟶IE3F+32p2IE3 is very high, since d is removed from stable 2p3 configuration.O2p4⟶IE1O⊕2p3⟶IE2O2p2⟶IE3+2O+321IE3 is not high in comparison to IE3 of F, since e- can be removed easily from not so stable 2p2 configuration.

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