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Formal charge is the valence electron of an atom in isolated state minus electron assigned to it in combined state.
Formal charge = isolated state valence e Assigned in combined state
: Br: 1. In the given structure in (B = Bs) B-Br bond 11 B B or; Valence eo of 'Bk in isolated state = 7 Assigned eo in combined state Br = 7-6 = 6 formal charge charge on ti valence ♡ of 'B' in isolated state = 3 Assigned eo in combined state = 4 charge on formal charge B - 3-4 =-1 on Br Hence, formal charge B and is (alti). and hence, (c) option is comect.
2. When a bond is formed between atoms of greater electronegativity difference, the eo gets shifted from atom.
.
Of dess electronegativity towards the atom of more electronegativity and hence the bond becomes polas. Therefore, the polarity of a covalent bond is due to greater electronegativity difference between two atoms. option (b) is (b) is correct. I 3. The co₂ molecule is : O=C sp hybridised and hence have linear geometry.
The dipole moment of c=0 (1) gets can uiled with dipole moment of Czo(I) 180° opposite each other. as it lies Hence, A CO2 molecule contains two polas bonds, but het dipole moment is zero because the molecule has symmetrical whear geometry and dipole moments cancel out each other Hence, (a) option is corect.
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