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JEE Main levelSingle correct optionDifficulty 2 of 3cc188

Which of the following mononuclear carbonyls does NOT obey the 18-electron rule?

A $V (CO) X_{6}$
B $Cr (CO) X_{6}$
C $Fe (CO) X_{5}$
D $Ni (CO) X_{4}$

Answer: A

Count = metal valence electrons + 2 per

CO

.

Cr (CO) X_{6}

:

6 + 12 = 18

;

Fe (CO) X_{5}

:

8 + 10 = 18

;

Ni (CO) X_{4}

:

10 + 8 = 18

;

V (CO) X_{6}

:

5 + 12 = 17

. So

V (CO) X_{6}

is the exception.

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