Deck 12: Radicals

Question 1

What is the first step in the radical halogenation of an alkane?

A) abstraction
B) initiation
C) propagation
D) combination
E) termination

Answer 1

initiation

Question 2

Which of the following radicals is the most stable?

A)
B)
C)
D)
E)

Answer 2

Question 3

Calculate the percentage yield of the product below formed by radical bromination. [Relative reactivities: 1°(1), 2°(82), 3°(1600)]

A) 5%
B) 15%
C) 29%
D) 41%
E) 71%

Answer 3

71%

Question 4

Of the following ethers, which would be least likely to form peroxides and hence be safer to use in a laboratory?

A)
B)
C)
D)
E)

Question 5

Which compound will be the major product of the following radical
Addition reaction?

A)
B)
C)
D)
E)

Question 6

How many isomers are formed in the radical addition of HBr to 1-methylcyclohexene?

A) 1
B) 2
C) 3
D) 4
E) 6
Two new asymmetric centers are created in the product.

Question 7

How many monobrominated constitutional isomers are possible for the following reaction?

A) 2
B) 3
C) 4
D)5
E) 6

Question 8

Rank the radicals in order from most stable to least stable.

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

Question 9

Which compound will give one product upon radical bromination using NBS, ROOR, and heat?

A)
B)
C)
D)
E)

Question 10

Radical inhibitors ____________.

A) prevent oxidation reactions
B) form less reactive radicals
C) destroy reactive radicals
D) include hydroquinones and vitamins A and E
E) do all of the above