Question

How many stereoisomers are there for the following structure?

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

The correct option is A 2

In absence of internal mirror plane. A maximum number of stereoisomers possible is $2^n$ with n being the number of stereocenters in the molecule.There is only one chiral centre (stereocenters) i.e 4th carbon. hence only two stereo isomers are possible. $2^1=2$