Consider the molecules C H 4 , N H 3 and H 2 O . Which of the given statements is false?

Consider the molecules CH4, NH3 and H2O . Which of the given statements is false?
  1. The H - C - H bond angle in CH4 , the H - N - H bond angle in NH3 , and the H - O - H bond angle in H2O are all greater than 90o .
  2. The H - O - H bond angle in H2O is larger than the H - C - H bond angle in CH4 .
  3. The H - O - H bond angle in H2O is smaller than the H - N - H bond angle in NH3 .
  4. The H - C - H bond angle in CH4 is larger than the H - N - H bond angle in NH3 .

Solution

Bond Angle Molecule
104.5o H2O
107o NH3
109o28′ CH4
All the molecules are sp3 hybridized and Bond angle of H2O is smaller than NH3 because in H2O two lone pairs are present due to which there will be more lone pair-lone pair repulsion while inNH3,only one lone pair is present, so lone pair-bond pair repulsion is present only.

Asked in: NEET 2016 (Phase 1)

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