Question

Which of the following is the staggered conformation for rotation about $C_1$ and $C_2$ bond in the following structure?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

In given compound, the rotation is about $C_1$and $C_2$ bond. Thus focusing on substituents of $C_1$ and $C_2$, we have 3 hydrogen atom attached to $C_1$ and one H, one $C{H}_3$ and one $C_2{H}_5$ group attached to $C_2$. Here, the molecule is viewed from $C_1$ carbon and for staggered conformation the diheral angle between the substituent of adjacent carbon should be ${60}^o$. Having all this mind and observing the options, we can find that option (a) is correct.