Question 1

Which of the following best describes the structure of an alkyne?

Accepted Answer

A hydrocarbon containing at least one carbon-carbon triple bond $$\ce{C#C}$$

Question 2

Which of the following is the correct IUPAC name for the compound $$\ce{CH2=CH-CH2-CH3}$$?

Accepted Answer

But-1-ene

Question 3

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

Accepted Answer

It occurs when each carbon of the double bond has two different substituents.

Question 4

Which of the following best explains the Markovnikov rule in the addition of $$\ce{HBr} to $$propene ($$\ce{CH3-CH=CH2}$$)?

Accepted Answer

The bromine atom attaches to the more substituted carbon of the double bond.

Question 5

Which of the following is a natural alkene that acts as a precursor to vitamin A in the human body?

Accepted Answer

$$\beta-$$carotene

Question 6

What is the main product when ethene ($$\ce{CH2=CH2}) $$reacts with water in the presence of sulfuric acid?

Accepted Answer

Ethanol ($$\ce{CH3CH2OH})$$

Question 7

Which of the following is the correct absolute (E/Z) configuration for the following compound: $$\ce{CH3CH=CHCl}$$, where the methyl and chlorine are on opposite sides of the double bond?

Accepted Answer

(E)-1-chloroprop-1-ene

Question 8

Which of the following best describes the industrial importance of ethene ($$\ce{CH2=CH2}$$)?

Accepted Answer

It is used as a monomer in the production of polyethylene.

Question 9

A student is asked to name the following compound: $$\ce{HC#C-CH2-CH=CH2}. $$What is the correct IUPAC name?

Accepted Answer

Penta-1,4-diene-2-yne

Question 10

Which of the following statements about the hydration of alkenes is correct?

Accepted Answer

It typically requires an acid catalyst such as $$\ce{H2SO4}.$$

Question 11

Which of the following is a correct example of a polymer formed from an alkene?

Accepted Answer

Polyvinyl chloride (PVC) from chloroethene

Question 12

Which of the following best explains why alkenes can exhibit cis-trans isomerism but alkynes cannot?

Accepted Answer

The triple bond in alkynes is linear, preventing the existence of geometric isomers.

Question 13

Which of the following is the correct product of the catalytic hydrogenation of 1-butyne ($$\ce{CH#C-CH2-CH3}) $$using excess $$\ce{H2}$$ and a metal catalyst?

Accepted Answer

Butane ($$\ce{CH3CH2CH2CH3})$$

Question 14

A patient with a diet deficient in vitamin A may develop which of the following symptoms?

Accepted Answer

Night blindness and xerophthalmia (dry eyes)

Question 15

Which of the following best describes the anti-Markovnikov addition of $$\ce{HBr} to an $$alkene in the presence of peroxides?

Accepted Answer

The bromine atom attaches to the less substituted carbon of the double bond.

Question 16

Which of the following is the correct IUPAC name for the compound with the structure $$\ce{CH3CH=CHCH2CH3}$$?

Accepted Answer

Pent-2-ene

Question 17

Which of the following is a correct statement about the oxidation of alkenes with cold, dilute $$\ce{KMnO4}$$?

Accepted Answer

It produces vicinal diols (glycols) as the main product.

Question 18

Which of the following is the correct IUPAC name for a compound with both a double and a triple bond, given the structure $$\ce{CH2=CH-C#C-CH3}$$?

Accepted Answer

Penta-1-en-3-yne

Question 19

Which of the following is a correct example of a conjugated diene?

Accepted Answer

Buta-1,3-diene ($$\ce{CH2=CH-CH=CH2})$$

Question 20

Which of the following is the correct product of the halogenation of ethene ($$\ce{CH2=CH2}) $$with bromine ($$\ce{Br2}$$)?

Accepted Answer

1,2-dibromoethane ($$\ce{BrCH2CH2Br})$$

Hidrocarburos Insaturados: Alquenos y Alquinos – Estructura, Nomenclatura y Reacciones

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