how many different molecules are drawn below?

Explanation:

Step1: Analyze molecular structures

Check for identical or isomeric structures.

Step2: Group equivalent structures

By comparing carbon - chain connectivity and branching patterns.

Step3: Count unique groups

Determine the number of non - equivalent molecular structures.

Upon close inspection, we can see that there are 2 different molecules. Some of the structures are just different orientations of the same molecule.

Answer:

2