Question 1

Which of the following statements best describes the difference between cyclopropane and cyclobutane?

Accepted Answer

Cyclopropane has three carbon atoms arranged in a triangle, while cyclobutane has four carbon atoms arranged in a square.

Question 2

What is the general formula for cycloalkanes, and how does it differ from the formula for straight-chain alkanes?

Accepted Answer

Cycloalkanes: $$C_nH_{2n}$$; Straight-chain alkanes: $$C_nH_{2n+2}$$

Question 3

Which of the following is the correct balanced equation for the complete combustion of methane?

Accepted Answer

$$CH_4 + 2$$ $$O_2$$ \rightarrow $$CO_2 + 2 H_2O$

Question 4

What is the main product formed when there is insufficient oxygen during the combustion of methane?

Accepted Answer

Carbon monoxide ($$CO)$$

Question 5

Which of the following best describes the geometry of the carbon atoms in ethylene ($$CH_2$$=$$CH_2$$)?

Accepted Answer

Each carbon is trigonal planar with bond angles of $$120^	ext{o}$$

Question 6

Which of the following is the correct IUPAC name for a compound with a triple bond between carbons 1 and 2 in a four-carbon chain?

Accepted Answer

1-butyne

Question 7

Which structure below represents 4-methylcyclopentene?

Accepted Answer

Structure D

Question 8

Which statement about cis–trans isomers is correct?

Accepted Answer

Cis–trans isomers occur when different groups are attached to each end of a double bond.

Question 9

Which of the following is a constitutional isomer of cis-2-butene?

Accepted Answer

1-butene

Question 10

What is the result of the addition of $$Br_2 to an $$alkene?

Accepted Answer

A dihalide is formed, with two bromine atoms added across the double bond.

Question 11

Which of the following best explains the role of a catalyst in the hydrogenation of alkenes?

Accepted Answer

A catalyst lowers the activation energy without affecting the change in free energy ($$\Delta G).$$

Question 12

Which of the following reactions requires a strong acid catalyst such as $$H_2SO_4$$?

Accepted Answer

Hydration of alkenes

Question 13

According to Markovnikov’s Rule, when $$HBr is $$added to propene, where does the hydrogen atom attach?

Accepted Answer

To the carbon atom with more hydrogen atoms

Question 14

Which of the following is a monomer used to make polyvinyl chloride (PVC)?

Accepted Answer

$$CH_2=$$CHCl$$

Question 15

Which of the following is the correct structure for benzene?

Accepted Answer

A six-membered ring with alternating single and double bonds, all carbons are trigonal planar.

Question 16

What is the name of the compound shown with a benzene ring, a bromine substituent, and a hydroxyl group in the meta position?

Accepted Answer

meta-bromophenol

Question 17

Which of the following conditions is required for the nitration of benzene?

Accepted Answer

$$HNO_3/H_2SO_4$

Question 18

Which of the following best describes the reaction of benzene with $$Br_2 in $$the presence of $$FeBr_3$$?

Accepted Answer

Substitution reaction forming bromobenzene

Question 19

Sulfa drugs work by interfering with bacterial synthesis of which essential molecule?

Accepted Answer

Folic acid

Alkanes, Alkenes, Alkynes, and Aromatic Compounds: Structure, Nomenclature, and Reactions

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