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15.
Which is the least stable in these structures if the radical carbon is changed to a carbanion?
(answer is A, pay attention to sign of charge!)
16.
The major monobromination product in the following reaction is
(CH
3
)
3
CCH
2
CH
3
+ Br
2
products
h
n
(CH
3
)
3
CCH
2
CH
2
Br
(CH
3
)
3
CCHCH
3
Br
(CH
3
)
2
CCH
2
CH
3
Br
(CH
3
)
2
CCH
2
CH
3
CH
2
Br
(a)
(b)
(c)
(d)
(e) none of the above
The answer is (C) because selectivity is high for bromination which prefers to attach the weaker C-H
bond.
17.
According to the following energy profile, the rate of reaction from A to B is determined by
E
reaction coordinate
A
B
C
(a) the energy of A only
(b) the energy of B only
(c) the energy difference between C and A
(d) the energy difference between B and A
(e) the energy of C only
The answer is C (activation energy)
