MCQ
Correct order of bond length is
- ✓$CO_3^{2 - } > C{O_2} > CO$
- B$C{O_2} > CO > CO_3^{2 - }$
- C$CO > C{O_2} > CO_3^{2 - }$
- DNone of these
✓
Answer
Correct option: A.
$CO_3^{2 - } > C{O_2} > CO$
(a) From valency bond theory, bond order in $CO$,
i.e. $:\mathop C\limits^ - \equiv \mathop O\limits^ + :$ 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. $CO < C{O_2} < CO_3^{2 - }$.
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