Explai why the following molecules are non-polarr: (i) C Cl_(4), (ii) CS_(2), (iii) BF_(3), (iv) 1,3,5-trinitrobenzene, (v) trans-2,3-dichlorobut-2-ene.

Explai why the following molecules are non-polarr: (i) C Cl_(4), (ii)

1.	Explai why the following molecules are non-polarr: (i) C Cl_(4), (ii) CS_(2), (iii) BF_(3), (iv) 1,3,5-trinitrobenzene, (v) trans-2,3-dichlorobut-2-ene.
Answer» Solution :(i), (ii) & (iii) (iv) In 1,3,5-trinitrobenzene, the three `NO_(2)` groups are bonded to 3 alternate `sp^(2)` hybridised C ATOM of the benzene RING. The three `C-NO_(2)` bond moments act at an ANGLE of `120^(@)` to each other. Therefore, the net dipole moment of the molecule is zero `(mu=0)` and the molecules isnon-polar. ltBrgt (V) In trans-2,3-dichlorobut-2-ene, the two C-Cl and the two `C-CH_(3)` bond moments act in upposite direction to balance each other. because of this, the molecule possesses no net dipole moment. hence, trans-2,3-dichlorobut-2-ene is non-polar.