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Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryChemical Bonding and Molecular Structure1 Mark
MCQ
The correct order of a dipole moment is:
  • A
    CH4​<NF3​<NH3​<H2​O
  • B
    NF<CH4​<NH3​<H2​​O
  • C
    NH3<NF3​<CH4​​<H2​​O
  • D
    H2​​O<NH3​<NF3<CH4​
✓

Answer

  1. CH4​<NF3​<NH3​<H2​O

Explanation:

The correct order of dipole moment is CH4​<NF3​<NH3​<H2​O.

Methane is zero dipole moment as it is tetrahedral molecule in which C−H bond dipoles cancel each other.

In NF3​, the bond dipole of the lone pair and the resultant dipole of three N−F bonds are in opposite direction wheres in ammonia, they are in same direction.

Hence, the dipole moment of NF3​ is smaller than that of methane.

The dipole moment of water is greater than the dipole moment of ammonia as oxygen is more electronegative than nitrogen.

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