Question 1

Which of the following best describes a condensation reaction in organic chemistry?

Accepted Answer

A reaction where two molecules combine to form a larger molecule, releasing a small molecule such as water.

Question 2

In the mechanism shown, what does the curved arrow represent?

Accepted Answer

The movement of a pair of electrons from a nucleophile to an electrophile.

Question 3

Which of the following is true about concerted reaction mechanisms?

Accepted Answer

Bond breaking and bond formation occur simultaneously in a single step.

Question 4

Which of the following is a correct example of a substitution reaction?

Accepted Answer

$$\mathrm{RA} + \mathrm{B} \rightarrow \mathrm{RB} + \mathrm{A}$$

Question 5

Which condition is NOT typically required for an organic reaction to proceed?

Accepted Answer

Exposure to ultraviolet light for all reactions

Question 6

In a homolytic bond cleavage, what is produced?

Accepted Answer

Two free radicals

Question 7

Which of the following is a correct representation of a Bronsted-Lowry acid-base reaction?

Accepted Answer

$$\mathrm{HA} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{A}^- + \mathrm{H}_3\mathrm{O}^+$$

Question 8

Which statement best describes a Lewis base?

Accepted Answer

A species that donates a pair of electrons in a chemical reaction.

Question 9

Which of the following is an example of an elimination reaction?

Accepted Answer

$$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3 \xrightarrow{\Delta} \mathrm{CH}_2=\mathrm{CH}_2 + \mathrm{CH}_4$$

Question 10

Which of the following is true about the transition state in a reaction energy diagram?

Accepted Answer

It represents the highest energy point along the reaction pathway.

Question 11

Which of the following is a correct example of an oxidation-reduction (redox) reaction in organic chemistry?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_5\mathrm{CH}_2\mathrm{OH} + \mathrm{Ag}_2\mathrm{O} \rightarrow \mathrm{C}_6\mathrm{H}_5\mathrm{CHO}$$

Question 12

Which of the following statements about nucleophiles is correct?

Accepted Answer

Nucleophiles are electron-rich species that donate electrons to electrophiles.

Question 13

Which of the following is a correct example of a reaction intermediate?

Accepted Answer

A carbocation formed during a multi-step reaction.

Question 14

Which of the following is NOT a typical site of reactivity in organic molecules?

Accepted Answer

A saturated alkane chain ($$\mathrm{C}-\mathrm{C}$$ single bonds)

Question 15

Which of the following best describes a heterolytic bond cleavage?

Accepted Answer

Both electrons from the bond go to one atom, forming ions.

Question 16

Which of the following is a correct example of an addition reaction?

Accepted Answer

$$\mathrm{C}=\mathrm{C} + \mathrm{AB} \rightarrow \mathrm{C}-\mathrm{A}-\mathrm{B}$$

Question 17

Which of the following is true about catalysts in organic reactions?

Accepted Answer

Catalysts increase the rate of reaction without being consumed.

Question 18

Which of the following is a correct example of a condensation reaction between an alcohol and a carboxylic acid?

Accepted Answer

$$\mathrm{CH}_3\mathrm{COOH} + \mathrm{CH}_3\mathrm{CH}_2\mathrm{OH} \rightarrow \mathrm{CH}_3\mathrm{COOCH}_2\mathrm{CH}_3} + \mathrm{H}_2\mathrm{O}$$

Question 19

Which of the following is true about the activation energy ($$E_a) in a $$reaction?

Accepted Answer

$$E_a is $$the minimum energy required for reactants to reach the transition state.

Introducción a las Reacciones Orgánicas: Conceptos Fundamentales y Clasificación

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