Question 1

Which of the following best describes the hybridization of the carbon atoms in ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

Both carbons are $$\mathrm{sp^2$}$$ hybridized.

Question 2

Which representation of a molecule provides the most information about the three-dimensional arrangement of atoms?

Accepted Answer

Line angle drawing with dashes and wedges

Question 3

Given the molecule $$\mathrm{CH_3CH_2CH_2CH(OH)CH_3$}$$, which functional group is present?

Accepted Answer

Alcohol

Question 4

Which of the following molecules contains a carboxylic acid functional group?

Accepted Answer

$$\mathrm{CH_3COOH}$$

Question 5

What is the main difference between a structural (constitutional) isomer and a stereoisomer?

Accepted Answer

Structural isomers have different connectivity of atoms; stereoisomers have the same connectivity but differ in spatial arrangement.

Question 6

Which of the following statements about London dispersion forces is correct?

Accepted Answer

They occur in all molecules, including non-polar ones.

Question 7

A molecule has a $$\mathrm{C=O}$$ double bond and an $$\mathrm{OH}$$ group attached to the same carbon. Which functional group does it contain?

Accepted Answer

Carboxylic acid

Question 8

Which of the following best explains why acetone ($$\mathrm{CH_3COCH_3}) is $$soluble in water?

Accepted Answer

It contains a polar $$\mathrm{C=O}$$ group that interacts with water via dipole-dipole forces.

Question 9

Which of the following is the correct line angle drawing for pentan-2-ol ($$\mathrm{CH_3CH_2CH(OH)CH_2CH_3}$$)?

Accepted Answer

A zig-zag line with an $$\mathrm{OH}$$ group attached to the second carbon from the left.

Question 10

Which of the following molecules would have the largest overall dipole moment?

Accepted Answer

$$\mathrm{CH_3COCH_3} ($$acetone)

Question 11

Which functional group is responsible for the biological activity of amoxicillin, allowing it to interact with enzymes?

Accepted Answer

Amide group

Question 12

Which of the following is true about the solubility of organic molecules in solvents?

Accepted Answer

Polar molecules dissolve in polar solvents.

Question 13

Which of the following is a correct condensed structural formula for an ether?

Accepted Answer

$$\mathrm{CH_3CH_2OCH_3}$$

Question 14

Which atom is most likely to be involved in hydrogen bonding in organic molecules?

Accepted Answer

Oxygen

Question 15

Which of the following is a correct example of a main chain and branch in a hydrocarbon?

Accepted Answer

Main chain: 4 carbons; branch: methyl group on carbon 2

Question 16

Which of the following best describes the bonding in an alkyne functional group?

Accepted Answer

A carbon-carbon triple bond with $$\mathrm{sp}$$ hybridization

Question 17

Which of the following molecules contains a ketone functional group?

Accepted Answer

$$\mathrm{CH_3COCH_3}$$

Question 18

Which of the following is a correct statement about functional groups?

Accepted Answer

Functional groups determine the chemical properties and reactivity of organic molecules.

Question 19

Which of the following is a correct Lewis structure for a nitrogen atom in an amine group?

Accepted Answer

Nitrogen with three single bonds and one lone pair

Question 20

Which of the following molecules is most likely to have a nonzero dipole moment?

Accepted Answer

$$\mathrm{CH_3CH_2OH}$$

Lecture 3 - Properties of Organic Molecules: Representation, Structure, and Functional Groups

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