In the following skew conformation of ethane,
Question:

In the following skew conformation of ethane, $\mathrm{H}^{\prime}-\mathrm{C}-\mathrm{C}-\mathrm{H}^{\prime \prime}$ dihedral angle is :

  1. $58^{\circ}$

  2. $149^{\circ}$

  3. $151^{\circ}$

  4. $120^{\circ}$


Correct Option: , 2

Solution:

$\therefore$ Angle between $\mathrm{H}^{\prime}$ and $\mathrm{H}^{\prime \prime}=120^{\circ}+29^{\circ}=149^{\circ}$

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