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The correct decreasing order of bond angle among CH4, NH3 and H2O is:

Answer: CH4 > NH3 > H2O.

  • A H2O > NH3 > CH4
  • B CH4 > NH3 > H2O
  • C NH3 > CH4 > H2O
  • D CH4 > H2O > NH3

Correct answer: B. CH4 > NH3 > H2O

Explanation: Increasing lone pairs on the central atom compress the bond angle: CH4 (109.5) > NH3 (107) > H2O (104.5).

Linear180 deg, e.g. CO2Trigonal Planar120 deg, e.g. BF3Tetrahedral109.5 deg, e.g. CH4Trigonal Bipyramidale.g. PCl5Octahedrale.g. SF6

VSEPR theory predicts molecular shape from the number of bonding and lone electron pairs around the central atom.

Concept context

Understand how atoms join to form molecules. Covers ionic and covalent bonding, VSEPR theory, hybridization (sp, sp², sp³), molecular orbital theory, bond polarity, and intermolecular forces like hydrogen bonding.

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