Q30 / 90 · JEE Main 2019 (12 Apr Shift 2) · Chemistry

In the following skew conformation of ethane, $H^{'} - C - C - H^{″}$ dihedral angle is:

A
$58^{o}$
B
$120^{o}$
Correct answer
C
$149^{o}$
D
$151^{o}$

Solution

The structure given in question is in staggered form. Hence, the two planes are

120 °

apart.
Given difference in angle of

H - C - H

bond is

29 .

∴ T h e d i h e d r a l a n g l e w i l l b e 120 ° + 29 ° = 149 °

Hence, the correct answer is option: 'C'.

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