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5.
Which of the following alkyl halides would undergo S
N
2 reaction most rapidly?
(A) CH
3
CH
2
-Br
(B) CH
3
CH
2
- Cl
(C) CH
3
CH
2
-I
(D) CH
3
CH
2
-F
(E) they react at the same rate
In Sn2 reaction, the nucleophile attacks from the back of the leaving group. The better the leaving
group, the easier it is to leave (faster rate). The answer is C since iodide ion is the best leaving
group.
6.
Which of the following molecules is chiral ?
CH
3
CH
3
H
H
CH
3
H
H
CH
3
OH
CH
3
(A)
(B)
(C)
C
C
CH
3
H
CH
3
H
C
C
H
CH
3
CH
3
H
(D)
(E)
Go by definition or look for plane of symmetry/point of inversion. The answer is B.
7.
The relationship between (A) and (B) structures in the previous question is:
A) identical
B) structural isomers
C) diastereomers
D) enantiomers
E) None of the above
Again need to know terms and how to apply them. The answer is C.
