Question 1

Which of the following are radical inhibitors?

Accepted Answer

Vitamin E and BHT (Butylated Hydroxytoluene) are both known as radical inhibitors. They act by scavenging free radicals, thus preventing oxidative damage in various materials, including biological systems and food products.

Question 2

The proposed reaction between chlorofluorocarbons and ozone involves what type of mechanism?

Accepted Answer

The reaction between chlorofluorocarbons (CFCs) and ozone primarily involves a radical mechanism, where CFCs under UV radiation decompose to form chlorine radicals, which then react with ozone, leading to its depletion.

Question 3

The proposed reaction of the oxidation of unsaturated lipids involves what type of mechanism?

Accepted Answer

The oxidation of unsaturated lipids typically involves a radical mechanism, where free radicals are generated and react with the double bonds in the lipids, leading to the formation of lipid peroxides.

Question 4

Which of the following statements about the stereochemistry of halogenation reactions is true?

Accepted Answer

An achiral starting material can lead to either an achiral product if no new stereocenters are created during the reaction, or a racemic mixture if a new stereocenter is formed, assuming the reaction conditions do not favor one enantiomer over the other.

Question 5

What is the product of the following reaction?

Accepted Answer

The answer of What is the product of the following...

Question 6

What is the product of the following reaction?

Accepted Answer

The answer of What is the product of the following...

Question 7

Which of the following statements about the propagation steps in the chlorination of ethane is true?

Accepted Answer

Radical chlorination of ethane involves two main propagation steps: the abstraction of a hydrogen atom by a chlorine radical and the reaction of the resulting ethyl radical with another chlorine molecule.

Question 8

Which of the following statements about carbon radicals isnot true?

Accepted Answer

Carbon radicals cannot be classified as quaternary because quaternary carbon centers do not have a hydrogen atom to lose and form a radical; they are defined by being bonded to four other carbon atoms. The classification into primary, secondary, and tertiary refers to the number of carbon atoms a carbon atom is bonded to, not applicable to radicals in the context of quaternary classification.

Question 9

Which of the following statements about radicals and radical reactions isnot true?

Accepted Answer

Radicals are characterized by having an unpaired electron, which often results in them not having an octet of electrons. This makes statement C incorrect, as it inaccurately suggests that radicals contain an atom with a complete octet of electrons.

Question 10

Which of the following statements about chlorination is true?

Accepted Answer

The answer of Which of the following statements about chlorination...

Question 11

A possible reaction of ethane with chlorine is shown below.

This reaction could conceivably occur by the following chain mechanisms [1], [2], and [3]. Determine DH for step [1].
Bond dissociation energies (kcal/mol):
  
$\begin{array}{|l|l|}
\hline \text { Bond A-B } & \Delta \mathrm{H} \
\hline \mathrm{Cl}-\mathrm{Cl} & 58 \
\mathrm{CH}_{3}-\mathrm{H} & 104 \
\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{H} & 98 \
\mathrm{CH}_{3}-\mathrm{CH}_{3} & 88 \
\mathrm{CH}_{3}-\mathrm{Cl} & 84 \
\mathrm{H}-\mathrm{Cl} & 103 \
\hline
\end{array}$

Accepted Answer

The answer of A possible reaction of ethane with chlorine...

Question 12

A possible reaction of ethane with chlorine is shown below.

This reaction could conceivably occur by the following chain mechanisms [1], [2], and [3]. Determine DH for step [2].
Bond dissociation energies (kcal/mol):
  
$\begin{array}{|ll|}
\hline \text { Bond } \mathrm{A}-\mathrm{B} & \Delta \mathrm{H} \
\hline \mathrm{Cl}-\mathrm{Cl} & 58 \
\mathrm{CH}_{3}-\mathrm{H} & 104 \
\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{H} & 98 \
\mathrm{CH}_{3} \mathrm{CH}_{3} & 88 \
\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{Cl} & 81 \
\mathrm{H}-\mathrm{Cl} & 103 \
\hline
\end{array}$

Accepted Answer

The answer of A possible reaction of ethane with chlorine...

Question 13

What is the product of the following reaction?

Accepted Answer

The answer of What is the product of the following...

Question 14

A possible reaction of ethane with chlorine is shown below.
This reaction could conceivably occur by the following chain mechanisms [1], [2], and [3]. The chain propagating step(s) is (are) ________.

Accepted Answer

The answer of A possible reaction of ethane with chlorine...

Question 15

Which of the following statements about radicals is true?

Accepted Answer

The answer of Which of the following statements about radicals...

Question 16

Which of the following statements is (are) true about free radical halogenation of alkanes?

Accepted Answer

The answer of Which of the following statements is (are)...

Quiz 21: Amines

Which of the following are radical inhibitors?

The proposed reaction between chlorofluorocarbons and ozone involves what type of mechanism?

The proposed reaction of the oxidation of unsaturated lipids involves what type of mechanism?

Which of the following statements about the stereochemistry of halogenation reactions is true?

What is the product of the following reaction?

What is the product of the following reaction?

Which of the following statements about the propagation steps in the chlorination of ethane is true?

Which of the following statements about carbon radicals isnot true?

Which of the following statements about radicals and radical reactions isnot true?

Which of the following statements about chlorination is true?

What is the product of the following reaction?

A possible reaction of ethane with chlorine is shown below. This reaction could conceivably occur by the following chain mechanisms [1], [2], and [3]. The chain propagating step(s) is (are) ________.

Which of the following statements about radicals is true?

Which of the following statements is (are) true about free radical halogenation of alkanes?