Question 1

Which of the following statements best explains why carbon is the central element in organic chemistry?

Accepted Answer

Carbon can form stable, extended chains and rings due to its ability to make four covalent bonds.

Question 2

Which of the following is the correct general formula for alkanes?

Accepted Answer

$$C_nH_{2n+2}$$

Question 3

What is the molecular geometry around each carbon atom in methane ($$CH_4$$)?

Accepted Answer

Tetrahedral

Question 4

Which of the following best describes a structural (constitutional) isomer?

Accepted Answer

Compounds with the same molecular formula but different bonding arrangements

Question 5

Which hybridization is present in the carbon atoms of ethene ($$C_2H_4$$)?

Accepted Answer

$$sp^2$$

Question 6

A hydrocarbon with the formula $$C_5H_{12}$$ can have how many structural isomers?

Accepted Answer

3

Question 7

Which of the following is NOT a property of alkanes?

Accepted Answer

They contain at least one double or triple bond.

Question 8

Which of the following best describes the bonding in ethyne ($$C_2H_2$$)?

Accepted Answer

One sigma ($$\sigma) $$bond and two pi ($$\pi) $$bonds between the carbon atoms

Question 9

Which of the following is the correct IUPAC name for the compound with the structure below?

$$\mathrm{CH_3$-CH_2$-CH(CH_3$)-CH_2$-CH_3$}$$

Accepted Answer

3-Methylpentane

Question 10

Which of the following real-world substances is NOT primarily composed of organic molecules?

Accepted Answer

Table salt (NaCl)

Question 11

Which of the following best describes the difference between a condensed structural formula and a line structure?

Accepted Answer

A condensed structural formula shows all atoms and bonds, while a line structure omits C-H bonds and carbon labels.

Question 12

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

Accepted Answer

Functional groups determine the chemical reactivity of organic molecules.

Question 13

Which of the following is the correct name for the compound with the following structure?

$$\mathrm{CH_3CH_2CH_2CH_2OH}$$

Accepted Answer

1-Butanol

Question 14

Which of the following best describes the geometry and hybridization of the carbon atom in carbon dioxide ($$CO_2$$)?

Accepted Answer

Linear geometry, $$sp$$ hybridization

Question 15

Which of the following is a hydrocarbon derivative?

Accepted Answer

Sucrose ($$C_{12}H$$_{22}$$O_{11}$)

Question 16

Which of the following is the correct condensed structural formula for 2,2-dimethylpropane?

Accepted Answer

$$(CH_3$)_4C$$

Question 17

Which of the following is a correct statement about the number of possible structural isomers for alkanes as the number of carbon atoms increases?

Accepted Answer

The number of possible structural isomers increases rapidly with the number of carbon atoms.

Question 18

Which of the following best describes the bonds in an alkane molecule?

Accepted Answer

All bonds are single sigma ($$\sigma) $$bonds.

Question 19

Which of the following is the correct IUPAC name for the compound with the following structure?

$$\mathrm{CH_3CH_2CH(CH_3$)CH_2CH_2CH_3}$$

Accepted Answer

3-Methylhexane

Week 9 Study Guide: Introduction to Organic Chemistry and Hydrocarbons

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