Which of the two conformation among the following represents staggered form of ethane?
A
1 and 4
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B
2 and 3
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C
1 and 2
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D
1 and 3
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Solution
The correct option is C 1 and 2 In staggered conformation, atoms/substituents attached to adjacent carbons are as far as possible.
In ethane, H atoms on adjacent carbons are present at dihedral angle of 60o ( 180o or 300o ) to have staggered conformation.
In (1) and (2), the dihedral angle is 60o.
In (3), it is in skew conformation (dihedral angle is < 60o).
In (4), the ethane is in eclipse conformation where the dihedral angle is 0o.