Q: What is the molecular geometry around each carbon atom in ethylene ($$C_2H_4$$)?

Trigonal planar, with bond angles of $$120^\\circ$$

Q: Which of the following is true about the geometry of methane ($$CH_4$$)?

It is a tetrahedral molecule with bond angles of $$109.5^\\circ$$

Question 1

Which of the following best describes an alkene?

Accepted Answer

A hydrocarbon that contains a C=C double bond

Question 2

What is the correct IUPAC name for the molecule with the structure $$CH_3CH_2CH_2CH=CH_2$?

Accepted Answer

1-Pentene

Question 3

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

Accepted Answer

They have the same molecular formula and the same connectivity, but differ in the arrangement of groups around the double bond.

Question 4

Given the molecule $$CH_3CH_2C \equiv $$CCH_3$$, what is its IUPAC name?

Accepted Answer

2-Hexyne

Question 5

Which of the following is a correct step in naming an alkene according to IUPAC rules?

Accepted Answer

Number the chain so that the double bond gets the lowest possible number.

Question 6

What is the molecular geometry around each carbon atom in ethylene ($$C_2H_4$$)?

Accepted Answer

Trigonal planar, with bond angles of $$120^\circ$$

Question 7

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

Accepted Answer

$$CH_3CH=$$CHCH_3$$

Question 8

A compound has the formula $$C_4H_8. $$Which of the following is a possible structure for this compound?

Accepted Answer

Cyclobutane

Question 9

Which of the following is a constitutional isomer of 1-butene ($$CH_2=$$CHCH_2CH_3$$)?

Accepted Answer

2-methylpropene ($$CH_2=C$$($$CH_3)_2$)

Question 10

Which of the following best describes the difference between alkenes and alkynes?

Accepted Answer

Alkenes contain a C=C double bond, while alkynes contain a C≡C triple bond.

Question 11

What is the correct IUPAC name for the molecule $$CH_3CH_2CH(CH_3$)CH=CH_2$?

Accepted Answer

3-Methyl-1-pentene

Question 12

Which of the following statements about the boiling points of alkenes and alkynes is correct?

Accepted Answer

Alkynes generally have higher boiling points than alkenes of similar molecular weight.

Question 13

Which of the following is the correct IUPAC name for a molecule with two double bonds at positions 2 and 4 in a six-carbon chain?

Accepted Answer

2,4-Hexadiene

Question 14

Which of the following is true about the geometry of methane ($$CH_4$$)?

Accepted Answer

It is a tetrahedral molecule with bond angles of $$109.5^\circ$$

Question 15

Which of the following is a correct description of a saturated hydrocarbon?

Accepted Answer

A molecule whose carbon atoms bond to the maximum number of hydrogen atoms

Question 16

Which of the following is the correct IUPAC name for the molecule $$CH_3CH_2CH_2C \equiv CH$$?

Accepted Answer

1-Pentyne

Question 17

Which of the following is a correct statement about the numbering of the main chain in alkenes?

Accepted Answer

Number the chain from the end nearest the double bond.

Question 18

Which of the following is a correct description of constitutional isomers?

Accepted Answer

Compounds with the same molecular formula but different connectivity of atoms

Question 19

Which of the following is a correct IUPAC name for a molecule with a methyl group on carbon 3 and a double bond starting at carbon 2 in a six-carbon chain?

Accepted Answer

3-Methyl-2-hexene

Alkenes & Alkynes: Structure, Nomenclature, and Isomerism

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