How do i determine the bond angel of the following compounds? and Bond Girl

How do i determine the bond angel of the following compounds?

1. C-C-N in Ch3-CN
2.C-N-C in Ch3NHCH3
3. C-C-C in Ch3CCH


I would really appreciate it if someone could explain how to determine the bond angles. I know that the unbonded and bonded electrons repel but idk what else.


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Answer by Cazley
1. The central carbon atom is triple bonded to the nitrogen and single bonded to the other carbon, and has no lone pairs. With two bonds and no lone pairs you have a linear arrangement, the bond angle is 180 degrees.

2. The nitrogen has three single bonds and a lone pair. This is the pyramidal arrangement (also called trigonal nonplanar) and the bond angles will be close to 107 degrees.

3. This is just like number 1. The central carbon is single bonded to one carbon and triple bonded to the other, with no lone pairs. As before, it's linear at this carbon with a bond angle of 180 degrees.

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