Question

5. There are three possible arrangements of atoms and nonbonding pairs of electrons for the AB,N2 geometry: B B Assuming that the effects of the relative strengths of different types of electron repulsions given in the Background Information are considerably more important for bond angles of 90° (or less) than for those of 120º (or greater), explain why the T-shape configuration is considered to be most accurate.

Answer 1

5) we know from VSEPR theo model, extent order of the bond pair (6p) - bp repulsion abond pair (bp)- lone paircip) > <!p-lp repulsion. Now, more the repulsion between lone pairy, less table will be the Structure or shape. Now, given 3 configurations of AB₂N2 molecule: (111 (0 B B 1 :111A 1 B110 B A AB / B B B number of Repulsion 1 o Ip-ip at 90°: Ip-bp at 90°; 4 برم 6

V Now, considering the lp-lp repulsion at 90°, the structure II is discarded as here one such kind of repulsion if present. Now between 0 and 11), considering the Ip-bp repulsion parameter, i.e the T shaped configuration is considered toll be as it have less number (4) kind of repulsion than in structure or configuration @cit has 6 1p-bop repulsion more accurate at 90°)