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Question

If a molecule MX3 has zero dipole moment, the sigma bonding orbitals used by M (atomic no.< 21) are:

A
pure p
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B
sp hybrid
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C
sp2 hybrid
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D
sp3 hybrid
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Solution

The correct option is C sp2 hybrid
Since atomic number is less than 21, d orbitals are not present.

When the atom M undergoes sp2 hybridization, the molecule has triagonal planar geometry and has zero dipole moment as the bond dipoles cancel.

135730_125798_ans.png

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