MHT CET · Chemistry · Chemical Bonding and Molecular Structure

Which among the following statements is NOT correct about dipole moment of \(\mathrm{NH}_3\) and \(\mathrm{NF}_3\) ?

A Fluorine is less electronegative than nitrogen.
B The dipole moment of \(\mathrm{NH}_3\) is more than that of \(\mathrm{NF}_3\).
C In \(\mathrm{NH}_3\) orbital dipole is in the same direction as that of resultant dipole moment of \(\mathrm{N}-\mathrm{H}\) bonds.
D In \(\mathrm{NF}_3\) orbital dipole is in the opposite direction of the resultant dipole moment of three N-F bonds.

Verified Solution

Answer & Solution

Correct Answer

(A) Fluorine is less electronegative than nitrogen.

Step-by-step Solution

Detailed explanation

\(\mathrm{F}\) is more \(\mathrm{EN}\) than \(\mathrm{N}\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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