The formation of molecular

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Question:

The formation of molecular complex $\mathrm{BF}_{3}-\mathrm{NH}_{3}$ results in a change in hybridisation of boron

  1. from $s p^{3}$ to $s p^{3} d$

  2. from $s p^{2}$ to $d s p^{2}$

  3. from $s p^{3}$ to $s p^{2}$

  4. from $s p^{2}$ to $s p^{3}$

Correct Option: , 4

Solution:

$\mathrm{CH}_{2} \mathrm{Cl}_{2}$ has lowest dipole moment

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