NEET 2017 Chemistry question

With respect to the conformers of ethane, which of the following statements is true?

(1)Bond angle remains same but bond length changes
(2)Bond angle changes but bond length remains same
(3)Both bond angle and bond length change
(4)Both bond angles and bond length remains sameCorrect

Answer: (4)

Solution

Conformers of ethane (the staggered and eclipsed forms and the skew forms in between) arise only by rotation about the C-C single bond. Such rotation changes the dihedral (torsional) angle between the C-H bonds on the two carbons. Rotation about a sigma bond

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Question ID VK-092060