question_answer

Dihedral angle between two methyl groups of n-butane in the gauche and anti-forms are

A)  \[60{}^\circ ,\,\,0{}^\circ \]          

B)        \[0{}^\circ ,\,\,60{}^\circ \]                        

C)  \[60{}^\circ ,\,\,180{}^\circ \]       

D)        \[180{}^\circ ,\,\,60{}^\circ \]

Correct Answer: C

Solution :

(The angle between C-C and C-H bonds on adjacent carbon atoms in any conformation is called dihedral angle.) Hence, the dihedral angle in case of gauche is \[60{}^\circ \]and in and form is\[180{}^\circ \].