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Which of following is not correct with respect to bond length of the species?

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C₂ > C₂^2–

B₂⁺ > B₂

Li₂⁺ > Li₂

O₂ > O₂^–

answer is D.

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Detailed Solution

species	C₂	C₂^-2
Electrons	12	14
B.O	2.0	3.0
B.L	C₂ >	C₂^-2

Species	B₂⁺	B₂
Electrons	9	10
B.O	0.5	1.0
B.L	B₂⁺ >	B₂

Species	Li₂⁺	Li₂
Electrons	5	6
B.O	0.5	1.0
B.L	Li₂⁺	>Li₂

Species	O₂	O₂^-
Electrons	16	17
B.O	2.0	<1.5
B.L	O₂	>O₂^-

Electrons	1	2	3	4	5	6	7	8
B.O	0.5	1	0.5	0	0.5	1	0.5	0
Mag.prop	P	D	P	D	P	D	P	D

Electrons	8	9	10	11	12	13	14	15	16	17	18	19	20
B.O	0	0.5	1.0	1.5	2.0	2.5	3	2.5	2.0	1.5	1.0	0.5	0
Mag.prop	D	P	P	P	D	P	D	P	P	P	D	P	P

Note : Molecules (or) ions with 2,4,6,8 and 12,14,18 electrons are diamagentic remaining are paramagnetic.

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