8. Dative bond is present in 4) BF3 3) Cl, 1) O, 2) NH3 Which of the following does not contain co-ordinate bond ? 2) NH, 9. 4) H,"O 3) SO3 1) BH, 25 10. Which have zero dipole moment ? 2) Cis-1,2-dichloroethane 1) 1,1-Dichloroethene 4) 1,2-Dichlorobenzene 3) Trans-1,2 dichloroethene 11. Select the correct relation 4) can't compared 2) UNH, >HNF, 3) NH,