JEE Main 2024 Chemistry question
Given below are two statements : Statement-I : Since Fluorine is more electronegative than nitrogen, the net dipole moment of NF₃ is greater than NH₃. Statement-II : In NH₃, the orbital dipole due to lone pair and the dipole moment of NH bonds are in opposite direction, but in NF₃ the orbital dipole due to lone pair and dipole moments of N-F bonds are in same direction. In the light of the above statements, choose the most appropriate from the options given below :
Solution
In NF₃ the orbital dipole of the lone pair and the N–F bond dipoles are in opposite directions, so they partly cancel, whereas in NH₃ they are in the same direction and add up. So NH₃ has the larger dipole moment
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