Which of the following carbocations is/are likely to rearrange? IV I II Ob. III Oc II and V Od IV What is the relationship between the two structures shown below? CH3 HC and HO H H Br Br OH Select one: OA enantiomers OB. identical compounds OC. diastereomers OD constitutional isomers E meso compounds

In light of your answer to Problem 11-74, explain why one of the following isomers undergoes E2 reaction approximately 100 times as fast as the other. Which isomer is more reactive, and why?

Which carbocation below is/are the most stable one? Circle it (them)

What (R) or (5) stereochemistry is proper for the following molecule? NH 2R, 3R 2R. 35 25, 3R

'Br OH 'Br "Br Br HO.,

4. Rank the following carbocations according to stability (1: most stable, 5: least stable.) e A OCH3 +

What is the expected major product for the following reaction? 1. Hg(OAc)2, H₂O 2. NaBH4, NaOH OH HO ? OH ㅎ... HO HO 11 III O IV OV + enantiomer || + enantiomer III IV V

b. Increasing reactivity with HBr H3C Н H3C A Н least reactive н н Н В I H3C Н C I н н Н D CH₂CH3 most reactive

Decide which carbocation in each pair is more stable

Name (including E/Z stereochemistry) the five alkenes that can produce 3-bromo-3-methylhexane on reaction with HBr.  Draw the skeletal structure of each molecule.