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Chemistry p1 doubt

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Deadly_king:

--- Quote from: Dania on November 18, 2010, 06:00:10 pm ---HELP!
The answer is C.

--- End quote ---

In order to find the bond angles, we should find its structure first.

Let's start with ----> The atom has around it, two bond pairs and two lone pairs of electrons. So it'll have a V-shaped(non-linear or bent) just like in a water molecule. So the bond angle will be 105o.

Now ----> The atom carries 4 bond pairs of electron which will give rise to a tetrahedral shape. So the bond angle will be 109.5o.

Last is ----> The atom carries 3 bond pairs of electron but also has one lone pair of electron around it. Therefore it will have a triangular pyramidal shape with bond angle 107o.

So in order of decreasing bond angles it will be :        

Answer is C.

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