Choose the terms that best describe the transformation shown below: stereospecific regioselective OH both regioselective and stereospecific neither regioselective nor stereospecific Save for Later OH

Consider the acyclic isomer pentane pictured below, informally named isopentane. Using your knowledge of conformational energy differences, match the correct description to the appropriate Newman projection. Ме -V Has the least storic repulsion / steric strain. -V Has the most torsional and steric strain overall Me - VHas two methyl-methyl gauche interactions - V Has only methyl-hydrogen eclipsed interactions H Me В. Me Me Me Me C. Me. Me H. H H Me Me Me H HI

A)Circle all of the stereo centers in MDMA. B) assign the absolute stereochemistry (R or S) for each stereo center

Which of the following are meso compounds? CH3 CH3 CH3 CH3 CH H- CI H CI -H CI- H CI- -CI H- -H H- H H- -H H -H H- -H H- -CI -H H H -CI H- -H CH3 CH3 CH3 CH3 CH3 D E A B