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Q. The species having bond order different from that in $CO$ is

JEE AdvancedJEE Advanced 2007

Solution:

$N O^{-}$is a $16$ electron system $(7+8+1=16)$ with zero bond order, whereas the other molecules such as $CO , NO ^{+}, CN ^{-}$and $N_{2}$ are $14$ electron systems with bond order of $3$ .