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  4. The observed dipole moment of nitromethane is higher than the dipole moment calculated from electronegativity of carbon, nitrogen and oxygen atoms because of

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Q. The observed dipole moment of nitromethane is higher than the dipole moment calculated from electronegativity of carbon, nitrogen and oxygen atoms because of

Organic Chemistry – Some Basic Principles and Techniques

Solution:

In nitromethane, hyperconjugation occur significantly as
image
The above hyperconjugation and involved charge separation is responsible for the large dipole moment of nitromethane than calculated theoretically.