TS EAMCET · Chemistry · Chemical Bonding and Molecular Structure

The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules, respectively is proportional to
[ $r$ is the distance between the polar molecules]

A $r^{3}; \frac{1}{r^{2}}$
B $\frac{1}{r^{3}}; \frac{1}{r^{6}}$
C $\frac{1}{r^{2}}; r^{2}$
D $\frac{1}{r^{2}}; \frac{1}{r^{4}}$

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Answer & Solution

Correct Answer

(B) $\frac{1}{r^{3}}; \frac{1}{r^{6}}$

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Detailed explanation

Dipole-dipole interaction energy between stationary polar molecules (as in solids) is proportional to 1/r3 and that between rotating polar molecules is proportional to1/r6, where r is the distance between polar molecules.The covalent molecules which have dipole moment zero are…

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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The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules, respectively is proportional to[r is the distance between the polar molecules]

Step-by-step Solution

The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules, respectively is proportional to
[ $r$ is the distance between the polar molecules]