Question 1

Which of the following statements best describes the geometry around the double bond in an alkene such as ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

The carbon atoms are arranged in a planar geometry with bond angles of approximately $$120^\circ.$$

Question 2

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_2$=CHCH_2CH_3}$$?

Accepted Answer

1-butene

Question 3

Which of the following best explains why cis-2-butene has a higher boiling point than trans-2-butene?

Accepted Answer

Cis-2-butene has a net dipole moment, resulting in stronger intermolecular forces.

Question 4

Which of the following is the product when 1-butene reacts with hydrogen ($$\mathrm{H_2$}) in $$the presence of a nickel catalyst?

Accepted Answer

Butane

Question 5

According to Markovnikov’s rule, what is the major product when propene ($$\mathrm{CH_3CH=CH_2$}) $$reacts with hydrogen bromide ($$\mathrm{HBr}$$)?

Accepted Answer

2-bromopropane

Question 6

Which of the following best describes the difference between an alkene and an alkyne?

Accepted Answer

Alkenes contain a double bond, while alkynes contain a triple bond.

Question 7

What is the geometry around each carbon atom in ethyne ($$\mathrm{C_2H_2}$$)?

Accepted Answer

Linear

Question 8

Which of the following is the correct IUPAC name for the compound $$\mathrm{CH_3C \equiv $$CCH_3$$}$$?

Accepted Answer

2-butyne

Question 9

When 2-butyne reacts with two equivalents of bromine ($$\mathrm{Br_2$}$$), what is the final product?

Accepted Answer

2,3,3,4-tetrabromobutane

Question 10

Which of the following compounds is aromatic?

Accepted Answer

Benzene

Question 11

Which of the following best explains the stability of benzene?

Accepted Answer

Benzene is stabilized by resonance, where the electrons are delocalized over the ring.

Question 12

Which of the following is the correct common name for methylbenzene?

Accepted Answer

Toluene

Question 13

What is the major product when benzene reacts with bromine ($$\mathrm{Br_2$}) in $$the presence of iron(III) bromide ($$\mathrm{$$FeBr_3$$}) $$catalyst?

Accepted Answer

Bromobenzene

Question 14

Which of the following statements about cis-trans isomerism in alkenes is correct?

Accepted Answer

Cis-trans isomerism occurs when each carbon of the double bond has two different groups.

Question 15

A patient is exposed to acetylene ($$\mathrm{C_2H_2}) in a $$welding accident. Which of the following statements about acetylene is correct?

Accepted Answer

Acetylene is an alkyne with a triple bond and linear geometry.

Question 16

Which of the following is the correct product when ethene ($$\mathrm{C_2H_4}) $$reacts with water in the presence of an acid catalyst?

Accepted Answer

Ethanol

Question 17

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_3CH=CHCH_2CH_3}$$?

Accepted Answer

2-pentene

Question 18

Which of the following best describes the product of the reaction between 1-butyne and excess hydrogen ($$\mathrm{H_2$}) $$with a platinum catalyst?

Accepted Answer

Butane

Question 19

Which of the following statements about aromatic substitution reactions is correct?

Accepted Answer

Aromatic substitution reactions typically require a catalyst to proceed.

Question 20

A chemist adds water to 2-methylpropene ($$\mathrm{CH_2$=C(CH_3$)_2}) in $$the presence of an acid catalyst. According to Markovnikov’s rule, what is the major product?

Accepted Answer

2-methyl-2-propanol

Chapter 12: Introduction to Organic Chemistry – Hydrocarbons (Alkenes, Alkynes, Aromatic Compounds)

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