The fully eclipsed conformation of n-butane is least stable due to the presence of;

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bond opposition strain as well as steric strain

no strain is present in the molecule.

bond opposition strain only

steric strain only

answer is B.

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The fully eclipsed form of n-butane has two methyl groups at the back of each other which makes it the least stable because of steric strain. Following is the diagram which shows a fully eclipsed form of n-butane.

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