Q.

Correct statement about conformers of ethane is

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a

 They have different bond angles and bond lengths

b

They have same dihedral angle

c

Torsional strain in staggered  form is more than in Eclipsed form

d

The difference in energy between staggered and eclipsed form is 12.55kJ/mole

answer is D.

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Detailed Solution

(1) …. Both eclipsed and staggered forms have same bondangle and bond length
(2) ….  Eclipsed and staggered forms have different dihedral angle.
 

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Question Image

(3) – Torsional strain (repulsions due to C–H bonds (or) bond pairs) is more in Eclipsed form
(4)    Difference in the energy is 2.9 kcal/mole (or) 12.55kJ/mole

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