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Which of the following is the correct order of bond angle ?

$\begin{array}{1 1}(a)\;CH_4 > NH_3 > H_2O\\(b)\; NH_3 > H_2O > CH_4\\(c)\;H_2O > NH_3 > CH_4\\(d)\;CH_4 > H_2O > NH_3\end{array}$

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1 Answer

$CH_4 (109^{\large\circ}) > NH_3(107.5^{\large\circ}) > H_2O(105.5^{\large\circ})$
This is due to according to VSEPR theory,more the number of lp's on a central atom,the greater is the contraction caused in the angle between the bp's.
Hence (a) is the correct answer.
answered Mar 10, 2014 by sreemathi.v
 

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