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The energy required to rotate n-butane molecule about the carbon-carbon bond is called ___________

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The energy required to rotate n-butane molecule about the carbon-carbon bond is called ___________

(a) Rotational energy

(b) Torsional energy

(c) Enantiomeric energy

(d) Potential energy

I got this question during a job interview.

My question is from Conformations topic in portion Structure and Stereostructure of Molecules of Engineering Chemistry I

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Best answer
Correct choice is (b) Torsional energy

Best explanation: The energy required to rotate n-butane molecule about the carbon-carbon bond is called torsional energy. Torsion energy can be used to solve problems of general relativity especially the singularity problem.

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