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JEE Main levelSingle correct optionDifficulty 2 of 3cc189

The structure of $Mn X_{2} (CO) X_{10}$ has:

Aone Mn-Mn bond and no bridging CO
Btwo Mn-Mn bonds and no bridging CO
Cone Mn-Mn bond and two bridging CO
Dno Mn-Mn bond and two bridging CO

Answer: A

Each

Mn

has

7 + 5 \times 2 = 17

electrons, so one more electron each is needed. A single Mn-Mn bond supplies it, giving 18 electrons on each Mn. All ten

CO

are terminal.

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