Question

Which of the following is correct with respect to bond length of the species?
(a) C2 >C2²-
(b) B2+ >B2
(c) Li+> Li2
(d) N2+ >N2
(e) 02 >O2-
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Answer 1

Answer:

all are correct except (C) and (E)

Explanation:

from the MOT diagram, we can find the bond order of all the species.

and there is inverse relation b/w bond order and bond length.

A) C2 has 12 electrons and has bond order 2 while C2-2 has 14 electrons and bond order 3

more is the bond order less will be the bond length.

B) B2+ has 8 e- and 0 bond order B2 has 10 e-s and 1 bond order.

C) Li+ has 2 where Li2 has 6 e-s and both have the same bond order i.e. 1.

D)N2+ has 12 well as N2 has 14 e-s so the bond order of N2+ is less than that of N2 i.e. 12 and 14 resp. and more bond length.

E) O2 has 16 e-s and B.O 2 where O2- has 18 e-s and B.O 1 and B.L of O2- is more than that of O2.