Which of the following have $3c-2e^-$ bonds?
$I. \ Al_2Cl_6, \ II. \ B_2H_6, \ III. \ Fe_2Cl_6, \ IV. \ Si_2H_6$
$I. \ Al_2Cl_6, \ II. \ B_2H_6, \ III. \ Fe_2Cl_6, \ IV. \ Si_2H_6$
- A$I, \ II$
- B$II, \ IV$
- COnly $II$
- D$I, \ III, \ IV$
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