The Bond Angles In CH4 (109.5°), NH3 (107°) And ... - Wired Faculty

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Chemistry Of P-Block Elements

Question ICSEENICH12029291 Wired Faculty App The bond angles in CH4 (109.5°), NH3 (107°) and H2O (104.5°) are different although these molecules have the same hybridization, sp3. Give a suitable reason for this.    Solution Short Answer

In CH4, the central atom is C which is in sp3 hybridization state. The four H-atoms are situated at the four corners of the tetrahedron. The bond angle between H—C—H is 109.5° which is called the tetrahedral angle.

But in the case of NH3 and H2O molecules, their central atoms N and O have a lone pair of electrons. This lone pair causes repulsion of electrons and hence causes the decrease in the normal tetrahedral angle which gets reduced to 107° in NH3 and 104.5° in H2O.

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