EK 30' Exam Orgo Lecture 2

[thais]

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I just did this 30' exam and I am so confused 🙁
First of all, in regard to passage 1, how do we know which product represents A,B,C,D, and E isomers? Would we know through the boiling point values?
Thank you!

 

[Pisiform]

I just did this 30' exam and I am so confused 🙁
First of all, in regard to passage 1, how do we know which product represents A,B,C,D, and E isomers? Would we know through the boiling point values?
Thank you!

No not the boiling point but information from the passage. They told you A,B,C are optically active. which means D and E are optically inactive. They also told you C and D are stereosiomers. So, C is a steroisomer which is optically active and D is a sterosiomer which is optically inactive. The only way a steroisomer is optically inactive if it has a plane of symmetry (meso compound). So D is a meso compound

 

[thais]

Ok, that makes much more sense. It seems like it is more of a critical thinking passage than anything else.
THANKS!! 🙂