Draw every stereoisomer for 1,2-difluoro-1,2-dimethylcyclopentane. Use wedge-and-dash bonds for the substituent groups, and be sure that they are drawn on the outside of the ring, adjacent to each other. The skeletal structure of one molecule is included to indicate the proper format; modify the X's on the given structure to create the first stereoisomer.
Concepts and reason
If two or more compounds have same molecular formula, but different spatial arrangement of atoms or groups are called as stereoisomers.
First draw the structure of the given compound and count the number of chiral centres. If the compound has a plane of symmetry then number of stereoisomers of the compound can be calculated by using the following expression.
Number of stereoisomers= 2 -1
Here, n is the number of chiral centres.
The given compound has 2 chiral centers. Calculate the number of stereoisomers is as follows:
Number of stereoisomers is calculated by using the formula 2n -1. Here, n is number of chiral centers. The given compound has 2 chiral centers, so substitute the n value in the given formula.
The structures of three stereoisomers are,
Here, the compound 1,2-difluoro-1,2-dimethylcyclopentane has a plane of symmetry and it contains two chiral centres. So, number of possible stereoisomers for 1,2-difluoro-1,2-dimethylcyclopentane is 3 (i.e. one meso compound and two enantiomers).