Question 1

Which of the following features is essential for a compound to be classified as an organic compound?

Accepted Answer

Presence of a C–H bond

Question 2

Which of the following best explains why carbon can form such a diverse array of organic compounds?

Accepted Answer

Carbon forms strong C–C bonds due to its small atomic radius and effective orbital overlap.

Question 3

Which of the following is a correct condensed formula for butane?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_3}$$

Question 4

Which of the following best describes the difference between a structural formula and a molecular formula?

Accepted Answer

A structural formula shows how atoms are connected, while a molecular formula only shows the number and type of atoms.

Question 5

Given the skeletal formula below, how many hydrogen atoms are attached to the circled carbon atoms?

Accepted Answer

Each circled carbon has 1 hydrogen atom.

Question 6

What is the correct IUPAC name for the following structure: $$\mathrm{CH_3CH_2CH_2CH_3}$$?

Accepted Answer

Butane

Question 7

Which of the following is the correct systematic name for a molecule with the structure $$\mathrm{CH_3CH(CH_3$)CH_2CH_3}$$?

Accepted Answer

2-Methylbutane

Question 8

Which of the following is a secondary alkyl group?

Accepted Answer

Isopropyl

Question 9

What is the molecular formula for an alkane with 5 carbon atoms?

Accepted Answer

$$\mathrm{C_5H_{12}}$$

Question 10

Which of the following best describes the difference between saturated and unsaturated hydrocarbons?

Accepted Answer

Saturated hydrocarbons contain only single bonds, while unsaturated hydrocarbons contain at least one double or triple bond.

Question 11

Which of the following is a correct generic formula for an alkene?

Accepted Answer

$$\mathrm{C_nH_{2n}}$$

Question 12

Which of the following reactions is a halogenation reaction of an alkane?

Accepted Answer

$$\mathrm{C_2H_6 + Cl_2$ \xrightarrow{hv} C_2H_5Cl + HCl}$$

Question 13

Which of the following best describes a geometric (cis-trans) isomer?

Accepted Answer

Molecules with the same molecular formula and connectivity but different spatial orientation around a double bond.

Question 14

Which of the following is the correct product for the complete hydrogenation of 2-butene ($$\mathrm{CH_3CH=$$CHCH_3$$}$$)?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_3}$$

Question 15

According to Markovnikov’s rule, when water is added to propene ($$\mathrm{CH_2$=$$CHCH_3$$}) in $$the presence of acid, what is the major product?

Accepted Answer

2-Propanol ($$\mathrm{CH_3CHOHCH_3})$$

Question 16

Which of the following is the correct IUPAC name for the compound shown below (a benzene ring with two chlorine atoms at positions 1 and 4)?

Accepted Answer

1,4-dichlorobenzene

Question 17

Which of the following is a constitutional (structural) isomer of butane ($$\mathrm{C_4H_{10}}$$)?

Accepted Answer

2-Methylpropane

Question 18

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

Accepted Answer

Lewis structures show all atoms, bonds, and lone pairs, while structural formulas show only atoms and bonds.

Question 19

Which of the following is the correct condensed formula for the structure shown below (a straight chain of four carbons)?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_3}$$

Introduction to Organic Chemistry: Hydrocarbons (Ch.12 Study Notes)

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