Question

1. Draw the best Lewis structures of BF3 and NF3. a. Describe the geometries of these two molecules. b. Describe the shapes of these two molecules. c. Explain which of these molecules is polar and why. 2. Draw the best Lewis structure of SCI2 a. Describe the geometry and shape of this molecule b. Explain why this molecule is polar.

Answer 1

2:03 NE :-1,Asenede dipole Uomo- B momen't o b " L'entroteh V NX resulting difele moment is downurod. oto l e (@) | Geomebies:- The geomeloy!!, of BF3 molecule is Ugaon 6 Txugonal planare! The Geometry lof Nf3 molecule --is fugonal buscamidal? _(6) Shape :- teigonal planase | Pyramidal o As BF2 has three B-f bonder and has come uit dipole momentin but due to its trigonel is planar les shape, the net dipole Imoment ks Zero, Hence, Bf3 is non-polar | As NF3 has three to N-fi bonds and this one lone paire, it bar has some met dipole moment and Mence Nf₃ is polar molecule due to the magnitude of e downward libole moment is larger than the upward ºdibole moment,

- Sc. - a ce I geometry - Shape - tetrahedral Bent / Angular : -1(b) Selvis bolovi bilcause it has de trahedral geometry and in Bent shapé due to the which the downward dipole moment is larger than that of upward dipole moment, Hence it has soms net downward dibole moment. ' T net dipole moment is downwardt - as it is a resultant of three dipole moments.