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Arrange the following in the decreasing order of Bond angle 

1. CH4 , H2O, NH3 

2. C2H2 , B3F , CCl4

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1. CH4 , H2O, NH3 :

NH3 = 107° , Water= 104.5° , CH4 = 109.5°

Decreasing order of bond angle: H2O < NH3 < CH4

2. C2H2 , BF3 , CCl4 :

C2H2 = 1800, BF3 = 120° , CCl4 = 109.5°

Decreasing order of bond angle: CCl4 < BF3 < C2H2

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