MCQ
In $Fe_2(CO)_9$, the two iron atoms are
- Alinked only directly
- ✓linked directly along with $3\,CO$ molecules as bridging ligands
- Clinked only through $3\,CO$ molecules as bridging ligands
- Djoined through one $CO$ group as bridging ligands

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[$A$] the physical state of $\mathrm{X}_2$ at atom temperature changes from gas to solid down the group
[$B$] decrease in $HOMO-LUMO$ gap down the group
[$C$] decrease in $\pi^*-\sigma^*$ gap down the group
[$D$] decrease in ionization energy down the group

${\text{C}}{{\text{l}}_2}\,{\text{(1}}\,{\text{atm) |}}\,{\text{C}}{{\text{l}}^ - }\,{\text{(1}}\,\,{\text{M)}}\,{\text{|| C}}{{\text{l}}^ - }\,(0.1\,M)\,|\,C{l_2}\,(2\,atm)$
