Question 1

Which of the following statements best distinguishes organic compounds from inorganic compounds?

Accepted Answer

Organic compounds always contain carbon and hydrogen, while inorganic compounds may not contain carbon.

Question 2

A hydrocarbon is defined as a compound that contains only which elements?

Accepted Answer

Carbon and hydrogen

Question 3

What is the general formula for a straight-chain alkane?

Accepted Answer

$$C_nH_{2n+2}$$

Question 4

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

Accepted Answer

CH$$_3CH$_2CH$_2CH$_2CH$_2CH$_3$$

Question 5

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

Accepted Answer

Low melting point

Question 6

A student is given a compound with the formula $$C_7H_{16}. $$What is the name of this compound?

Accepted Answer

Heptane

Question 7

Which of the following best explains why alkanes are insoluble in water?

Accepted Answer

Alkanes are nonpolar and water is polar.

Question 8

Rank the following alkanes from lowest to highest boiling point: methane, ethane, butane, hexane.

Accepted Answer

Methane, ethane, butane, hexane

Question 9

Which of the following is an example of an aromatic hydrocarbon?

Accepted Answer

Benzene

Question 10

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

Accepted Answer

Organic compound

Question 11

Which of the following best describes the bonding in alkanes?

Accepted Answer

Single covalent bonds between carbon atoms

Question 12

What is the molecular formula for an alkane with 8 carbon atoms?

Accepted Answer

$$C_8H_{18}$$

Question 13

Which of the following is a correct line-angle formula representation?

Accepted Answer

Each vertex and end of a line represents a carbon atom.

Question 14

Which of the following is NOT a property of hydrocarbons?

Accepted Answer

High solubility in water

Question 15

A sample of gasoline is analyzed and found to contain only carbon and hydrogen. Which class of compounds does it belong to?

Accepted Answer

Hydrocarbons

Question 16

Which of the following best describes the trend in boiling points for straight-chain alkanes as the number of carbon atoms increases?

Accepted Answer

Boiling point increases as the number of carbon atoms increases.

Question 17

Which of the following is the correct IUPAC name for the compound with the condensed formula CH$$_3CH$_2CH$_2CH$_3$$?

Accepted Answer

Butane

Question 18

A patient is exposed to a hydrocarbon that is nonpolar, flammable, and not soluble in water. Which of the following is the most likely effect if the hydrocarbon is inhaled in large amounts?

Accepted Answer

It may cause respiratory irritation and central nervous system depression.

Question 19

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

Accepted Answer

Alkanes contain only single bonds, while alkenes contain at least one double bond.

Question 20

A chemist needs to identify an unknown compound. It is found to have a high melting point, is soluble in water, and does not burn in air. Which type of compound is it most likely to be?

Accepted Answer

Inorganic compound

Introduction to Organic Chemistry: Hydrocarbons (Ch. 11) - Mini Study Guide

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