Practice Exam 2 PDF

Preview

Summary

Practice exams that are in close relation to in-class exams....

Description

1) What is the relationship between the following compounds?

1)

A) diastereomers B) superimposable without bond rotation C) enantiomers D) constitutional isomers E) conformational isomers 2) Which of the following compounds has an asymmetric center?

A) I

B) II

C) III

2)

D) IV

E) V

3) Identify the following compounds as R or S.

A) S, S, R

B) S, S, S

C) R, R, R

3)

D) S, R, S

E) R, S, S

4) Which of the following compounds has an S configuration? A)

4)

B)

C)

D)

E)

5) Which of the following groups has the highest priority using the Cahn, Ingold, Prelog rules? A) OH B)

C)

D)

E) OCH3

5)

6) Identify the following compounds as R or S.

A) S, R, R

B) S, S, R

C) R, S, R

7) What is the relationship between the following compounds?

6)

D) S, S, S

E) R, R, R 7)

A) conformational isomers B) superimposable without bond rotation C) enantiomers D) constitutional isomers E) diastereomers 8) Identify all meso compounds.

A) A and B, A and D, B and C, C and D B) B and D C) B and D, A and B, A and D, B and C, C and D D) A and C E) B and D, A and C

8)

9) Name the structure.

9)

A) 3 -methylenehexane B) 2 -ethyl-1-pentene C) ethyl propyl ethene D) 3 -methyl-3- hexene E) 2 -propyl -1- butene 10) Which of the following is an allylic alcohol? A) CH2 =CHCH2OCH3 B) CH2 =CHCH2CH 2OH

10)

C) CH2 =CHCH2CH 3 D) CH3 CH=CHCH 2 OH E) HOCH= CHCH2CH3 11) Which of the following statements about propene, CH3CHCH2, is correct? A) The compound has a cis and trans isomer. B) All nine atoms lie in the same plane. C) There is a total of eight sigma bonds. D) It generally acts as a Lewis acid. E) All the carbon atoms are sp2 hybridized.

11)

12) Name the structure.

12)

A) (E)- 4,5- dimethyl-4- hepten-1-ol B) (Z)- 3,4- dimethyl-3- hepten-7-ol C) (Z)- 4,5- dimethyl-4- hepten-1-ol D) (E)- 3,4- dimethyl-3- hepten-7-ol E) (E)- 4,5- dimethyl-4- heptenol 13) Which of the following is capable of exhibiting cis-trans isomerism? A) ethene B) 2 -butene C) cyclohexene D) 1 -pentene E) 1 -butene

13)

14) Which of the following is not an electrophile? A) H+ B) BF3 C) CH2 CH2 D) + NO2

14)

E) Fe+ 3 15) Which of the following is not a nucleophile? A) BrB) CH3 OCH3 C) + CH 3

15)

D) E) NH3 16) An increase in which of the following results in a decrease in the rate of the chemical reaction? A) concentration B) collision frequency C) energy of activation D) temperature E) fraction of collisions with proper orientation

16)

17) How many transition states are present in the following reaction diagram?

17)

A) 4

B) 3

C) 5

D) 1

E) 2

18) What is the activation energy for the reaction B → A in the following diagram?

A) A

B) B

C) C

D) D

18)

E) E

19) Which of the following correctly describes the reaction shown?

19)

A) Δ H° >0 and ΔS° >0 B) Δ H° = ΔS = 0 C) Δ H° 0 D) Δ H° 0 and ΔS < 0 20) Which of the following is the most stable carbocation?

A) I

B) II

C) III

20)

D) IV

E) V

21) Which alkene reacts the fastest with HBr? A)

21)

B)

C)

D)

E)

22) What is the major product of the following reaction?

A) I

B) II

C) III

22)

D) IV

E) V

23) Identify the true statements in the mechanism in the addition of water to an alkene A) A carbocation is formed as an intermediate. B) The addition of the electrophile is a slow step. C) Water abstracts the extra proton from the protonated alcohol D) The addition of the nucleophile is a fast step E) All of the above

23)

24) Which of the following alkenes yield(s) 3-bromo-3-methylpentane as the major product upon addition of HBr?

24)

A) III only B) I and II only C) I, II, nad III only D) all of them E) none of them SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Note that thi is for the practice exam only. The actual exam will be multiple choice. 25) Complete the following tree of reactions by giving the major products:

25)

1) D 2) C 3) B 4) E 5) E 6) C 7) C 8) D 9) B 10) D 11) C 12) A 13) B 14) C 15) C 16) C 17) E 18) E 19) D 20) D 21) D 22) C 23) E 24) D 25)...