Question

Give reasons
(i)BF3 has a zero dipole moment although the B-F bonds are polar.
(ii)AlI carbon to oxygen bonds in C03^2- are equivalent.

Answer 1

Answer:

Hey mate here is your answer....

The three fluorine atoms are so attached to the boron that the resultant of two fluorine atoms cancel with the third one.

Boron trifluoride is has zero dipole moment although it has three polar B—F bonds. This is because BF3 has sp2 hybridisation and regular trigonal planal geometry. And hence the individual dipole moments of polar bonds get cancelled and overall dikpole moment is zero.

Answer 2

Answer:

(i) Boron trifluoride is has zero dipole moment although it has three polar B—F bonds. This is because BF3 has sp2 hybridisation and regular trigonal planal geometry. And hence the individual dipole moments of polar bonds get cancelled and overall dipole moment is zero.

(ii) In CO32- ion, all three carbon-oxygen bond lengths are 129 pm, intermediate between the lengths of C-O single bonds (143 pm) and C=O. double bonds (122 pm). Therefore, all carbon to oxygen bonds in CO32- ion are equivalent.

Hope this answer was helpful to you..

Explanation: