Question 1

Which type of arrow is used to represent the movement of a pair of electrons in organic reaction mechanisms?

Accepted Answer

Curly double-headed arrow

Question 2

In the homolytic cleavage of a bond, what is the result?

Accepted Answer

Both atoms retain one electron each, forming radicals

Question 3

Which of the following best describes a nucleophile?

Accepted Answer

A species that donates a pair of electrons to form a bond

Question 4

What is the main difference between homolytic and heterolytic bond cleavage?

Accepted Answer

Homolytic cleavage produces radicals, heterolytic cleavage produces ions

Question 5

Which reaction type involves the reorganization of bonds and atoms within a single molecule to yield an isomeric product?

Accepted Answer

Rearrangement reaction

Question 6

In the reaction mechanism for the chlorination of methane, which step involves the formation of radicals from a non-radical species?

Accepted Answer

Initiation

Question 7

Which of the following is an example of a polar reaction?

Accepted Answer

A nucleophile donating a pair of electrons to an electrophile

Question 8

What is the product of the following addition reaction: $$\mathrm{CH_2$=CH_2$} + \mathrm{Cl_2$} \rightarrow$$ ?

Accepted Answer

$$\mathrm{CH_2ClCH_2Cl}$$

Question 9

Which of the following best describes an electrophile?

Accepted Answer

A species that accepts a pair of electrons

Question 10

In the skeletal structure notation, what does each intersection represent?

Accepted Answer

A carbon atom

Question 11

Which of the following is a correct condensed structure for 2-methylbutane?

Accepted Answer

$$\mathrm{CH_3CH_2CH(CH_3$)CH_3$}$$

Question 12

Which of the following is NOT a general type of organic reaction?

Accepted Answer

Oxidation

Question 13

What is the result of the termination step in the chlorination of methane mechanism?

Accepted Answer

Radicals combine to form stable molecules

Question 14

Which of the following best describes a free radical?

Accepted Answer

A neutral species with a single unpaired electron

Question 15

In a substitution reaction, what happens?

Accepted Answer

Two reactants exchange parts to give two new products

Question 16

Which of the following is a correct representation of the elimination reaction of an alcohol to form an alkene?

Accepted Answer

$$\mathrm{CH_3CH_2OH} \rightarrow \mathrm{CH_2$=CH_2$} + \mathrm{H_2O}$$

Question 17

Which of the following statements about polar reactions is TRUE?

Accepted Answer

They involve unsymmetrical bond breaking and making

Question 18

What is the main reason polar reactions are common in drug action and metabolism?

Accepted Answer

They involve electrical attraction between positive and negative centers

Question 19

Which of the following is a correct skeletal structure convention?

Accepted Answer

Carbon atoms are represented by intersections of lines

Question 20

In the propagation step of the chlorination of methane, which of the following reactions occurs?

Accepted Answer

$$\mathrm{Cl\cdot} + \mathrm{CH_4$} \rightarrow \mathrm{HCl} + \mathrm{CH_3$\cdot}$$

Organic Reaction Mechanisms and Chemical Structure Representation

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