Chemical Bonding And Molecular Structure Question 72

Question: The correct order of increasing $ C-O $ bond length of $ CO,CO_3^{2-},CO_2 $ is

Options:

A) $ CO_3^{2-}<CO_2<CO $

B) $ CO_2<CO_3^{2-}<CO $

C) $ CO<CO_3^{2-}<CO_2 $

D) $ CO<CO_2<CO_3^{2-} $

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Answer:

Correct Answer: D

Solution:

B.O. in CO i.e., $ :\overset{-}{\mathop{C}},=\overset{+}{\mathop{O}},: $ is 3, that of $ O=C=O $ is 2 while that of $ CO_3^{2-} $ ion is 1.33. Since the bond length increases as the bond order decreases i.e. $ CO<CO_2<CO_3^{2-} $ . Thus option D is correct.



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