Question 1

Which of the following statements best describes a characteristic feature of organic compounds?

Accepted Answer

Organic compounds always contain carbon atoms, and most contain hydrogen.

Question 2

Methane ($\mathrm{CH_4}$) is an example of which type of organic molecule?

Accepted Answer

A simple hydrocarbon

Question 3

Which of the following is true about the bonding of carbon in organic compounds?

Accepted Answer

Carbon always forms four covalent bonds in organic compounds.

Question 4

Which of the following molecules contains a carbon-carbon double bond?

Accepted Answer

Ethylene ($\mathrm{C_2H_4}$)

Question 5

According to Valence Shell Electron Pair Repulsion (VSEPR) theory, what is the bond angle around each carbon atom in ethyne (acetylene, $\mathrm{C_2H_2}$)?

Accepted Answer

$180^\circ$

Question 6

Which of the following best describes the molecular geometry around the carbon atom in methane ($\mathrm{CH_4}$)?

Accepted Answer

Tetrahedral

Question 7

In the condensed structure $\mathrm{CH_3CH_2OH}$, what functional group is present?

Accepted Answer

A hydroxyl (alcohol) group

Question 8

Which of the following is a correct interpretation of a skeletal structure where a line ends without a label?

Accepted Answer

There is a carbon atom at the end of the line.

Question 9

How many hydrogens are bonded to a carbon atom in a skeletal structure if the carbon is at the end of a line and has only one bond shown?

Accepted Answer

Three hydrogens

Question 10

Which of the following is the correct condensed structure for a molecule with the following complete structure: $\mathrm{H_3C-CH_2-CH_2-CH_3}$?

Accepted Answer

$\mathrm{CH_3CH_2CH_2CH_3}$

Question 11

A molecule has the condensed structure $\mathrm{CH_3CH_2OCH_3}$. What is the shape around the oxygen atom?

Accepted Answer

Bent (due to two lone pairs)

Question 12

Which of the following best describes the process of converting a skeletal structure to a complete structure?

Accepted Answer

Place a carbon atom at every intersection and line end, then add enough hydrogens to make each carbon tetravalent.

Question 13

Capsaicin, the active component in chili peppers, is a complex organic molecule. Which of the following elements is most likely to be present in capsaicin besides carbon and hydrogen?

Accepted Answer

Oxygen

Question 14

Which of the following molecules is most likely to have a trigonal planar geometry around a carbon atom?

Accepted Answer

Ethylene ($\mathrm{C_2H_4}$)

Question 15

Which of the following is a correct statement about the representation of organic molecules?

Accepted Answer

Condensed structures omit most bond lines and group atoms together.

Question 16

In the skeletal structure of cyclohexane, how many carbon atoms are present?

Accepted Answer

Six

Question 17

Which of the following is the correct bond angle for a tetrahedral carbon atom?

Accepted Answer

$109.5^\circ$

Question 18

Estradiol is a female sex hormone with a complex structure. If a carbon atom in estradiol is bonded to three other atoms and has no lone pairs, what is its geometry?

Accepted Answer

Trigonal planar

Question 19

Which of the following is a correct step when interpreting a skeletal structure?

Accepted Answer

Add enough hydrogens to each carbon to make it tetravalent.

Question 20

Which of the following best explains why organic molecules can have a wide variety of shapes and sizes?

Accepted Answer

Carbon can form single, double, and triple bonds, and can bond to many different elements.

Introduction to Organic Molecules and Functional Groups: Chapter 11 Study Notes

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