Question 1

Which of the following statements best describes Markovnikov's Rule in the addition of HX to an unsymmetrical alkene?

Accepted Answer

The hydrogen atom adds to the carbon with the greater number of hydrogen atoms.

Question 2

Which functional group is present in the following molecule: $$CH_3COOH$$?

Accepted Answer

Carboxylic acid

Question 3

In the reaction mechanism for the addition of $$HBr to $$ethylene, which species acts as the electrophile?

Accepted Answer

Hydrogen ion ($$H^+)$$

Question 4

Which of the following is NOT a characteristic of a nucleophile?

Accepted Answer

A positive charge

Question 5

What is the major product when 2-pentene reacts with $$HBr$$ under Markovnikov conditions?

Accepted Answer

2-Bromopentane

Question 6

Which type of bond-breaking involves both bonding electrons staying with one atom, resulting in ions?

Accepted Answer

Unsymmetrical bond-breaking (polar)

Question 7

During the addition of $$HBr to 2-$$methyl-2-butene, a carbocation rearrangement occurs. What is the driving force for a hydride or methyl shift?

Accepted Answer

Formation of a more stable carbocation

Question 8

Which of the following best describes the electron flow in a nucleophilic addition reaction?

Accepted Answer

Electrons move from the nucleophile to the electrophile.

Question 9

Which of the following molecules is most polarizable?

Accepted Answer

Chloromethane

Question 10

A reaction gives two stereoisomeric products, but one is favored over the other. What term best describes this phenomenon?

Accepted Answer

Stereoselectivity

Question 11

Which of the following is a correct example of a functional group transformation in organic chemistry?

Accepted Answer

Conversion of an alkene to an alkane via hydrogenation

Question 12

In the addition of $$HBr to 3-$$methyl-1-butene, which rearrangement is most likely to occur?

Accepted Answer

Methyl shift

Question 13

Which of the following is true about electrophiles?

Accepted Answer

They have a positive or partial positive charge.

Question 14

What is the product of the acid-catalyzed hydration of ethylene ($$CH_2$$=$$CH_2$$)?

Accepted Answer

Ethanol ($$CH_3CH_2OH)$$

Question 15

Which reaction mechanism involves the movement of electrons from a nucleophile to an electrophile, forming a new covalent bond?

Accepted Answer

Unsymmetrical bond-making

Question 16

Which of the following is an example of regioselectivity?

Accepted Answer

A reaction that favors one constitutional isomer over another

Question 17

In the addition of $$HBr to 2-$$methyl-2-butene, which product is favored due to carbocation rearrangement?

Accepted Answer

2-Chloro-2-methylbutane

Question 18

Which of the following best describes the role of a catalyst in organic reactions?

Accepted Answer

It increases the rate of reaction by lowering the activation energy.

Question 19

Which of the following is a correct representation of a curved arrow in reaction mechanisms?

Accepted Answer

It shows the movement of electrons.

Question 20

Which of the following is true about the product distribution in a stereospecific reaction?

Accepted Answer

Only one stereoisomer is formed from each stereoisomeric reactant.

Alkenes: Addition Reactions, Mechanisms, and Functional Groups in Organic Chemistry

Study Guide - Practice Questions