The correct order of bond angles (smallest first) in H2S, NH3 , BF3 and SiH4 is

The correct order of bond angles (smallest first) in H2S, NH3 , BF3 and SiH4 is

  1. A

    H2S<SiF4<NH3<BF3

  2. B

    NH3<H2S<SiH4<BF3

  3. C

    H2S<NH3<SiH4<BF3

  4. D

    H2S<NH3<BF3<SiH4

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    Solution:

    Bond angle is H2S is near to 90°. Bond angle in NH3 is less than than 109°28' (a perfect tetrahedral angle) due to the electronic repulsion between lone pair and bonded pair. Bond angle in SiH4 is 109°28'. Bond angle in BF3 is 120°.

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