Question 1

Which property of carbon most directly explains its ability to form large, complex, and diverse molecules essential for life?

Accepted Answer

Its ability to form four covalent bonds with other atoms, including itself

Question 2

Which experiment by Friedrich Wöhler challenged the theory of vitalism by synthesizing an organic compound from inorganic materials?

Accepted Answer

The synthesis of urea from ammonium and cyanate ions

Question 3

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

Accepted Answer

Organic compounds contain carbon atoms bonded to hydrogen atoms

Question 4

A molecule with the formula $C_5H_{12}$ is classified as a hydrocarbon. Which property would you expect it to have?

Accepted Answer

It is likely to be hydrophobic and insoluble in water

Question 5

Which functional group is most likely to make a molecule hydrophilic and increase its solubility in water?

Accepted Answer

Hydroxyl group ($-OH$)

Question 6

A pharmaceutical company is developing a new drug. The drug has a chiral center (an asymmetric carbon). Why is it important to test both enantiomers of the drug?

Accepted Answer

One enantiomer may be effective while the other could be inactive or harmful

Question 7

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 8

Which of the following molecules contains a cis-trans isomerism?

Accepted Answer

A molecule with a double bond between two carbons and two different groups attached to each carbon

Question 9

Which functional group acts as an acid by donating a proton ($H^+$) in aqueous solution?

Accepted Answer

Carboxyl group ($-COOH$)

Question 10

A researcher finds two molecules with the same molecular formula, $C_4H_{10}O$, but different boiling points. Which concept best explains this observation?

Accepted Answer

They are structural isomers

Question 11

Which of the following statements about hydrocarbons is correct?

Accepted Answer

Hydrocarbons are composed only of carbon and hydrogen atoms

Question 12

Which functional group is present in ATP and is key to its role in energy transfer?

Accepted Answer

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

Question 13

A molecule contains both a carboxyl group and an amino group. Which class of biological molecules does it most likely belong to?

Accepted Answer

Amino acids

Question 14

Which of the following best explains why glucose is highly soluble in water?

Accepted Answer

It contains multiple hydroxyl groups ($-OH$) that form hydrogen bonds with water

Question 15

Which of the following is true about enantiomers?

Accepted Answer

They are mirror images of each other and may have different biological activities

Question 16

Which of the following functional groups is most likely to be found in a molecule that acts as a base in biological systems?

Accepted Answer

Amino group ($-NH_2$)

Question 17

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

Accepted Answer

Structural isomerism

Question 18

Which of the following best predicts whether an organic molecule will be hydrophobic or hydrophilic?

Accepted Answer

The presence of polar functional groups (such as $-OH$, $-COOH$, $-NH_2$) makes it hydrophilic

Question 19

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

Accepted Answer

The effectiveness of the drug thalidomide depends on its enantiomers, one of which caused birth defects

Question 20

Which of the following statements about the methyl group ($-CH_3$) is correct?

Accepted Answer

It is nonpolar and often reduces the solubility of organic molecules in water

Chapter 4: Carbon and the Molecular Diversity of Life – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards