Question 1

Which of the following statements best explains why hydrocarbons are generally insoluble in water?

Accepted Answer

Hydrocarbons are nonpolar molecules, while water is polar.

Question 2

Which of the following is the correct general formula for a straight-chain alkane?

Accepted Answer

$$C_nH_{2n+2}$$

Question 3

A compound has the molecular formula $$C_4H_{10}. $$Which statement is true about this compound?

Accepted Answer

It can exist as two different structural isomers.

Question 4

Which property is most typical of organic compounds compared to inorganic compounds?

Accepted Answer

Low melting point

Question 5

What is the IUPAC name for the following condensed formula: $$CH_3CH_2CH_2CH_3$$?

Accepted Answer

Butane

Question 6

Which of the following best describes an alkyl group?

Accepted Answer

An alkane with one hydrogen atom removed

Question 7

Which of the following is a correct example of a structural isomer?

Accepted Answer

Butane and methylpropane, both with formula $$C_4H_{10}$$

Question 8

Which of the following best describes the bonding in alkanes?

Accepted Answer

Only single bonds between carbon atoms

Question 9

A hydrocarbon is found to have the formula $$C_7H_{16}. $$What is the name of this compound?

Accepted Answer

Heptane

Question 10

Which of the following statements about aromatic compounds is correct?

Accepted Answer

They contain a ring structure with alternating double bonds.

Question 11

Which of the following is the correct condensed formula for pentane?

Accepted Answer

$$CH_3CH_2CH_2CH_2CH_3$$

Question 12

Which of the following best explains why the boiling point of alkanes increases with molecular weight?

Accepted Answer

Larger molecules have greater London dispersion forces.

Question 13

Which of the following is a property of most organic compounds?

Accepted Answer

They burn in air (are flammable).

Question 14

Which of the following is the correct name for the alkyl group $$-CH_2CH_3$$?

Accepted Answer

Ethyl

Question 15

A compound is found to be nonpolar, has a low boiling point, and is not soluble in water. Which type of compound is it most likely to be?

Accepted Answer

An alkane

Question 16

Which of the following best describes the difference between alkanes and alkenes?

Accepted Answer

Alkanes have only single bonds; alkenes have at least one double bond.

Question 17

Which of the following is the correct molecular formula for octane?

Accepted Answer

$$C_8H_{18}$$

Question 18

Which of the following is a correct statement about the structure of cycloalkanes?

Accepted Answer

Cycloalkanes have carbon atoms bonded in rings with only single bonds.

Question 19

Which of the following is the correct IUPAC name for $$CH_3CH_2CH_2CH_2CH_2CH_3$$?

Accepted Answer

Hexane

Question 20

Which of the following best describes a constitutional (structural) isomer?

Accepted Answer

Compounds with the same molecular formula but different connectivity of atoms.

Chapter 11: Introduction to Organic Chemistry – Hydrocarbons

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