MCQ
The correct order of a dipole moment is:
- ACH4<NF3<NH3<H2O
- BNF<CH4<NH3<H2O
- CNH3<NF3<CH4<H2O
- DH2O<NH3<NF3<CH4
✓
Answer
- CH4<NF3<NH3<H2O
Explanation:
The correct order of dipole moment is CH4<NF3<NH3<H2O.
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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