Deck 21: Alkenes and Alkynes: Electrophilic Addition and Pericyclic Reactions

Question 1

From the following alkenes, pick out the strongest nucleophile:

A) A
B) B
C) C
D) D

Answer 1

C

Question 2

Which of the following dienes is the most stable?

A) A
B) B
C) C
D) D
E) E

Answer 2

E

Question 3

For the following transformation, pick a suitable reagent from A-E:

A) A
B) B
C) C
D) D
E) E

Answer 3

B

Question 4

For the following transformation, pick a suitable reagent(s) from A-E:
A: Br₂
B: HBr
C: HBr, ROOR
D: Br₂, hv
E: NaBr

A) A
B) B
C) C
D) D
E) E

Question 5

From the following reactions, A-D, pick out those which lead to the formation of pent-1-yne. Please select all that apply.

A) A
B) B
C) C
D) D

Question 6

From the following reaction sequence, match the reagents to each step:

-MeI

A) Step 2
B) Step 3
C) Step 1

Question 7

From the following reaction sequence, match the reagents to each step:

-Na in NH₃

A) Step 2
B) Step 3
C) Step 1

Question 8

From the following reaction sequence, match the reagents to each step:

-NaNH₂

A) Step 2
B) Step 3
C) Step 1

Question 9

For the following reaction, pick out the products. Please select all that apply.

A) A
B) B
C) C
D) D
E) E

Question 10

For the following reaction, how many stereoisomeric products are formed?

A) 0
B) 1
C) 2
D) 3
E) 4

Question 11

From the following molecules, pick out those which are meso. Please select all that apply.

A) A
B) B
C) C
D) D
E) E

Question 12

For the following reaction, pick out the product:

A) A
B) B
C) C
D) D
E) E

Question 13

What is the major product of the following reaction?

A) A
B) B
C) C
D) D
E) E

Question 14

For the following reaction, pick out the product:

A) A
B) B
C) C
D) D
E) E

Question 15

What is the major product of the following reaction?

A) A
B) B
C) C
D) D
E) E

Question 16

For the following reaction, pick out the product:

A) A
B) B
C) C
D) D
E) E

Question 17

From the following reagents, A-E, pick out those which react with alkenes preferentially by syn-addition. Please select all that apply.

A) A
B) B
C) C
D) D
E) E

Question 18

For the following reaction, pick out the product:

A) A
B) B
C) C
D) D
E) E

Question 19

Ozonolysis of alkenes can lead to the formation of carbonyl derivatives. From the following reaction, pick out those alkenes which lead to formation of the given ketones. Please select all that apply.

A) A
B) B
C) C
D) D

Question 20

For the following reaction, pick out the product:

A) A
B) B
C) C
D) D
E) E

Question 21

For the following reaction, pick out the product:

A) A
B) B
C) C
D) D
E) E

Question 22

Which of the following carbocations is the most stable?

A) A
B) B
C) C

Question 23

Mass spectrometry can be used to reliably determine whether an alkene is of E or Z configuration.

Question 24

Identify suitable conditions to effect the following transformation.

A) H₂
B) H₂, Lindlar catalyst
C) H₂, Pd-on-C
D) LiAlH₄

Question 25

Identify suitable conditions 'X' to effect the reaction below. Please select all that apply.

A) Me₂S
B) Zn
C) PPh₃
D) H₂O₂

Question 26

Identify which pair of products would form in the following reaction:

A) Products A
B) Products B
C) Products C
D) Products D

Question 27

Identify the first-formed ionic intermediate generated upon the reaction of HBr with but-1-yne.

A) A
B) B
C) C
D) D