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Q.

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

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a

bond opposition strain only

b

steric strain only

c

bond opposition strain as well as steric strain

d

no strain is present in the molecule.

answer is B.

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Detailed Solution

  • 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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