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JEE Main levelOne or more correct optionsDifficulty 2 of 3cb009

In which of the following species is there a triple bond between the two atoms in the best Lewis structure?

A\ce{CO}
B\ce{CN-}
C\ce{NO+}
D\ce{O2}

Answer: A, B, C

CO

,

CN X^{-}

and

NO X^{+}

are isoelectronic with

N X_{2}

(10 valence electrons) and each has a triple bond.

O X_{2}

(12 electrons) has a double bond.

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