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Q.

Energy barrier between staggered and eclipsed conformations of ethane is

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a

0.6 kJ/mole

b

16 kJ/mole

c

12 kJ/mole

d

12.55 kJ/mole

answer is D.

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Detailed Solution

The eclipsed conformation has a higher energy than the staggered conformation by around 3 kcal/mol (12 kJ/mol). Torsional strain (or eclipsing strain) refers to the energy difference induced by eclipsing bonds' higher electrostatic repulsion. 

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