$$n \text{CH}_2=\text{CH}_2 \rightarrow (\text{CH}_2-\text{CH}_2)_n$$

$$\text{CH}_3\text{CH}_2\text{Br} \rightarrow \text{CH}_2=\text{CH}_2 + \text{HBr}$$

Question 1

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

Accepted Answer

Saturated hydrocarbons contain only carbon-carbon single bonds, while unsaturated hydrocarbons contain at least one carbon-carbon multiple bond.

Question 2

What is the correct IUPAC name for the compound with the structure: CH$$_3CH$_2C$	ext{≡}CH$$?

Accepted Answer

1-butyne

Question 3

Which of the following molecules can exhibit cis-trans isomerism?

Accepted Answer

2-pentene

Question 4

What is the bond angle in acetylene (ethyne), a molecule with a C$$	ext{≡}C $$triple bond?

Accepted Answer

$$180^\circ$$

Question 5

Which reaction type is illustrated by the following equation: CH$$_2=CH$_2 + Br$_2$$ → CH$$_2Br$$–CH$$_2Br$$?

Accepted Answer

Addition reaction

Question 6

In the hydrogenation of vegetable oil, which of the following best describes the chemical change?

Accepted Answer

Double bonds in the fatty acid chains are converted to single bonds by the addition of hydrogen.

Question 7

According to Markovnikov’s rule, in the hydrohalogenation of 2-methylpropene with HBr, where does the Br atom attach?

Accepted Answer

To the carbon of the double bond with fewer hydrogen atoms already attached.

Question 8

Which of the following is NOT a possible reaction for benzene under normal conditions?

Accepted Answer

Addition of Br$$_2$$

Question 9

What is the product of the reaction between methane and chlorine gas as shown: CH$$_4 + Cl$_2$$ → ?

Accepted Answer

CH$$_3Cl + $$HCl

Question 10

Which of the following polymers is formed from the monomer CH$$_2=$$CHCl?

Accepted Answer

Poly(vinyl chloride)

Question 11

Which of the following aromatic compounds is commonly used as a solvent and has the structure of a benzene ring with a methyl group attached?

Accepted Answer

Toluene

Question 12

What is the main difference in the chemical reactivity between alkenes and aromatic compounds?

Accepted Answer

Alkenes undergo addition reactions, while aromatic compounds undergo substitution reactions.

Question 13

Which of the following best describes the structure of benzene?

Accepted Answer

A ring of six carbon atoms with delocalized electrons forming resonance structures.

Question 14

Which of the following is a correct example of a polymerization reaction?

Accepted Answer

$$n 	ext{CH}_2=	ext{CH}_2 ightarrow (	ext{CH}_2-	ext{CH}_2)_n$$

Question 15

Which of the following statements about cycloalkenes is correct?

Accepted Answer

Cycloalkenes are cyclic hydrocarbons that contain at least one double bond.

Question 16

A student is asked to draw the structure of 3-ethyl-4-methyl-2-pentene. Which rule must they follow when numbering the carbon chain?

Accepted Answer

Number from the end nearest to the double bond.

Question 17

Which of the following is a correct example of an elimination reaction?

Accepted Answer

$$	ext{CH}_3	ext{CH}_2	ext{Br} ightarrow 	ext{CH}_2=	ext{CH}_2 + 	ext{HBr}$$

Question 18

Which of the following best explains why cis-trans isomerism is not possible in 2-methyl-1-butene?

Accepted Answer

One carbon of the double bond has two identical groups (hydrogens) attached.

Question 19

Which of the following is a real-life application of an alkene polymer?

Accepted Answer

Polypropylene is used for bottles, rope, and medical devices.

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

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