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JEE Main levelOne or more correct optionsDifficulty 2 of 3cc194

Which of the following mononuclear species are paramagnetic? (Treat $Co (CO) X_{4}$ as the neutral monomer.)

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

Answer: B, D

Electron counts:

Ni (CO) X_{4}

is 18 (diamagnetic);

V (CO) X_{6}

has

5 + 12 = 17

electrons, one unpaired;

Fe (CO) X_{5}

is 18 (diamagnetic);

Co (CO) X_{4}

has

9 + 8 = 17

, one unpaired. Correct: 2 and 4.

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