Question 1

Which of the following best describes the molecular geometry of methane, as shown in the second image?

Accepted Answer

Tetrahedral

Question 2

The third image shows a ball-and-stick model of a hydrocarbon. Which is the correct IUPAC name for this molecule?

Accepted Answer

Isobutane (2-methylpropane)

Question 3

The fourth image shows a straight-chain hydrocarbon. What is the molecular formula for this compound?

Accepted Answer

$$C_4H_{10}$$

Question 4

The fifth image shows a molecule with a green atom attached. What type of compound is this and what is the green atom most likely representing?

Accepted Answer

Alkyl halide; chlorine

Question 5

The sixth image shows a different arrangement of a green atom in a hydrocarbon. What is the correct IUPAC name for this compound?

Accepted Answer

2-chlorobutane

Question 6

The seventh image shows a gasoline pump with different octane ratings. Which compound is used as the standard for an octane rating of 100?

Accepted Answer

2,2,4-Trimethylpentane (isooctane)

Question 7

The eighth image shows a molecule with an oxygen atom (red) bonded to two carbon atoms. What class of compound does this represent?

Accepted Answer

Ether

Question 8

The ninth image shows a molecule with an oxygen atom bonded to a straight chain and a branched chain. What is the correct IUPAC name for this compound?

Accepted Answer

1-ethoxy-3-methylpentane

Question 9

The tenth image shows a molecule with an oxygen atom bonded to a branched carbon chain. What is the common name for this compound?

Accepted Answer

Isobutyl methyl ether

Question 10

The eleventh image shows a molecule with a red atom bonded to a single carbon. What is the correct IUPAC name for this compound?

Accepted Answer

Methanol

Question 11

The twelfth image shows a molecule with a red atom bonded to a two-carbon chain and a methyl group. What is the correct IUPAC name for this compound?

Accepted Answer

Question 12

The thirteenth image shows a plate of fish with lemon. According to organic chemistry, why is lemon often served with fish?

Accepted Answer

Citric acid in lemon protonates amines, reducing fishy odor

Question 13

The fourteenth image shows a molecule with a colored cloud around it. What does this cloud represent?

Accepted Answer

Electron density (electrostatic potential map)

Question 14

The fifteenth image shows a molecule with a red atom and a colored cloud. What property is being illustrated here?

Accepted Answer

Polarity of the molecule

Question 15

The sixteenth image shows three molecules with colored clouds. What trend is being illustrated?

Accepted Answer

Increasing molecular size increases electron cloud polarizability

Question 16

The seventeenth image shows a molecule with a green atom and a cloud. What type of intermolecular force is most significant for this molecule?

Accepted Answer

Dipole-dipole interactions

Question 17

The eighteenth image shows a helical structure with dashed lines. What do the dashed lines represent?

Accepted Answer

Hydrogen bonds

Question 18

The nineteenth image shows a molecular surface with a red region. What does the red region indicate?

Accepted Answer

Region of partial negative charge

Question 19

The twentieth image shows a molecular surface with a yellow-green region. What does this region indicate?

Accepted Answer

Region of low electron density

An Introduction to Organic Compounds: Nomenclature, Physical Properties, and Structure

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