Least coordination number is shown by

1. $\mathrm{Co}_2(\mathrm{CO})_8$
2. $\mathrm{Mn}_2(\mathrm{CO})_{10}$
3. $\left[\mathrm{Fe}(e n)_2 \mathrm{NH}_3\right]$
4. $\left[\mathrm{Cr}(\mathrm{OH})_3\left(\mathrm{NH}_3\right)_3\right]$

Asked in: NEET 2008 (Mains)

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