Question 1

Which property of carbon most directly explains its ability to form a large variety of stable organic molecules essential for life?

Accepted Answer

Its valence of 4, allowing it to form up to four covalent bonds

Question 2

Which of the following best describes a structural isomer?

Accepted Answer

Molecules with the same molecular formula but different covalent arrangements of their atoms

Question 3

A molecule with the formula $$C_4H_{10}$$ can exist as either butane or isobutane. What type of isomerism does this illustrate?

Accepted Answer

Structural isomerism

Question 4

Which functional group is responsible for the acidic properties of amino acids?

Accepted Answer

Carboxyl group $$-COOH$$

Question 5

A patient is found to have a genetic mutation that prevents the formation of disulfide bonds in proteins. Which functional group is most likely affected?

Accepted Answer

Sulfhydryl group $$-SH$$

Question 6

Which of the following statements about enantiomers is correct?

Accepted Answer

They are mirror images of each other and are built around an asymmetric carbon

Question 7

Which functional group is most likely to be found in molecules that act as bases in biological systems?

Accepted Answer

Amino group $$-NH_2$

Question 8

A molecule contains a carbonyl group at the end of its carbon chain. What type of compound is this molecule?

Accepted Answer

Aldehyde

Question 9

Which of the following best explains why alcohols (molecules with a hydroxyl group) are generally soluble in water?

Accepted Answer

The hydroxyl group $$-OH is $$polar and can form hydrogen bonds with water

Question 10

Which of the following functional groups is most likely to be involved in energy transfer reactions, such as those involving ATP?

Accepted Answer

Phosphate group $$-PO_4$^{2-}$$

Question 11

A researcher is studying two molecules with the same molecular formula, but one has a double bond between the first and second carbon, while the other has it between the second and third carbon. What type of isomerism is this?

Accepted Answer

Structural isomerism

Question 12

Which of the following statements about hydrocarbons is correct?

Accepted Answer

Hydrocarbons can vary in length, branching, double bond position, and presence of rings

Question 13

Which of the following best describes the difference between a ketone and an aldehyde?

Accepted Answer

A ketone has a carbonyl group within the carbon chain, while an aldehyde has it at the end

Question 14

Which of the following is a real-world example of the importance of enantiomers in biology?

Accepted Answer

The effectiveness of certain drugs, such as thalidomide, where one enantiomer is therapeutic and the other is harmful

Question 15

Which of the following best explains why carbon can form both polar and nonpolar covalent bonds?

Accepted Answer

Carbon's electronegativity allows it to share electrons equally or unequally depending on the bonding partner

Question 16

A molecule contains both a carboxyl group and an amino group. Which class of biological molecules is this most likely to be?

Accepted Answer

Amino acid

Question 17

Which of the following functional groups is most likely to increase the solubility of an organic molecule in water?

Accepted Answer

Hydroxyl group $$-OH$$

Question 18

A molecule with the formula $$C_6H_{12}O_6$ can exist as both glucose and galactose. What type of isomerism does this represent?

Accepted Answer

Structural isomerism

Question 19

Which functional group is most likely to be found in molecules that participate in phosphorylation reactions in cells?

Accepted Answer

Phosphate group $$-PO_4$^{2-}$$

Question 20

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

They are responsible for the unique chemical properties and reactivity of organic molecules

Chapter 4: Carbon, Bonds, and Functional Groups – Study Notes

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