The nature of bonding in Be(CO)2 and Be2(CO)4 has been discussed on th
e basis of bond indices, valencies and localized MOs. Similar calculat
ions have been performed also on HBeBeH in order to elucidate the natu
re of the BeBe bond in Be2(CO)4. According to the present calculations
the BeBe bond in Be2(CO)4 is a single bond and not a strong double bo
nd as has been claimed earlier.