32) What alkene would yield the following products upon ozonolysis?
CH
3
CH
2
CH
2
CH
2
CHO + CH
2
O
2
to (E)-hex-3-ene produces
A) a meso dibromide
B) a mixture of enantiomeric dibromides which is optically active
C) a mixture of enantiomeric dibromides which is optically inactive
D) (Z)-3,4-dibromo-3-hexene
E) (E)-3,4-dibromo-3-hexene
34) The mechanism for the acid-catalyzed hydration of alkenes is the reverse of the acid-catalyzed
35) Which of the following is the best reaction sequence to accomplish a Markovnikov addition of water to
an alkene with minimal skeletal rearrangement?
A) water + dilute acid
B) water + concentrated acid
C) oxymercuration-demercuration
D) hydroboration-oxidation
E) none of the above
36) Which of the following additions to alkenes occur(s) specifically in an anti fashion?
A) hydroboration-oxidation
B) addition of Br
2
C) addition of H
2
D) addition of H
2
O in dilute acid
E) both A and B
37) Which of the following additions to alkenes occur(s) specifically in an syn fashion?
A) dihydroxylation using OsO
4
, H
2
O
2
B) addition of H
2
C) hydroboration
D) addition of HCl
E) A, B, and C
38) HBr can be added to an
alkene in the presence of peroxides (ROOR). What function does the peroxide
serve in this reaction?
A) nucleophile
B) electrophile
C) radical chain initiator
D) acid catalyst
E) solvent