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Q.

Which of the following species does/do not exist?

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a

ICI3⊕

b

NCI5

c

NH2⊕

d

OF4

answer is A.

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Detailed Solution

(1) ICl3⊕: I=5s25p5,I⊕=5s25p4ICl3⊕is not formed since only 2e 's can be excited from I⊕ by Cl atom.(2) NCl5 does not exist, due to non-vacant d-orbitals.(3) OF4: OF4 does not exist since only 2e- s can be excited from O-atom by F-atom.
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