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Q.

Two isomers A and B can be separated from their mixture if the energy barrier is 

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a

0.6 Kcal/mole 

b

9 Kcal/mole

c

16 Kcal/mole 

d

12 Kcal/mole

answer is C.

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Detailed Solution

  • The energy barrier is caused by atoms rotating along carbon-carbon bonds due to their geometrical orientation. 
  • For the separation of two isomers A and B from their mixture, the energy barrier must be 16Kcal/mole
  • The eclipsed conformation is the least stable with the maximum energy whereas the staggered conformation is relatively more stable with less energy.
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