00:01
Hi, in this question they have asked about three geometries that is tetrahedral, pyramidal and pent structure.
00:08
We all know that all these structures have four electron domains but still their bond angles and also the shape differs.
00:21
Why? we need to explain that.
00:23
So for tetrahedral the bond angle is 109 .5 degree, for pyramidal it is 107 .5 degree, for bent it is 105 degree.
00:39
So there is a difference in the bond angle and also shape.
00:44
So here in tetrahedral we can say we have four bond pair.
00:50
In pyramidal we can have three bond pair and one lone pair.
01:02
So this is your bond pair and you have one lone pair.
01:08
So here you can see in the bent structure you have two bond pair and two lone pair.
01:20
So you have all the four bond pair so there is no much electron repulsion between the two bond.
01:27
So it is divided themselves in the three dimensional space to form tetrahedral structure.
01:35
So here the repulsion is less.
01:46
Therefore the bond angle is 109 .5 degree...