उत्तर : 4. "जिसके परमाणुआें पर कम से कम फाॅम॔ल आवेश हो"
व्याख्या :

Generally, the structure with minimum energy is the one whose atoms have minimum formal charge. The principle of formal charge is based on the pure covalent nature of bonding, in which electrons are shared equally between the bonded atoms.