Question

which line - angle formula corresponds to the chair conformation shown below? br h3ch2c ch2ch3 ch2ch3 ch2ch3 ch2ch3 br br br br i ii iii iv ii i iv iii

Explanation:

Step1: Analyze the chair - conformation

In the given chair - conformation, the ethyl group ($\text{H}_3\text{CH}_2\text{C}-$) and the bromine atom ($\text{Br}$) have a trans - relationship.

Step2: Examine the line - angle formulas

In formula I, the ethyl and bromine are cis. In formula II, the ethyl and bromine are trans. In formula III, the positions of the substituents are incorrect. In formula IV, the substituents' relative positions are also incorrect. So, the line - angle formula that corresponds to the chair - conformation is II.

Answer:

A. II