$$\text{A straight chain of six connected lines}$$

Question 1

Which of the following statements about hydrocarbons is CORRECT?

Accepted Answer

Hydrocarbons contain only C–C and C–H bonds, and any other atoms present are called heteroatoms.

Question 2

What is the hybridization and geometry of a carbon atom in ethene ($$C_2H_4$$)?

Accepted Answer

sp$$^2$$ hybridized, trigonal planar geometry

Question 3

Which of the following line-bond structures represents hexane?

Accepted Answer

$$	ext{A straight chain of six connected lines}$$

Question 4

How many secondary carbons are present in 2-methylpentane?

Accepted Answer

Two

Question 5

Which of the following is a correct definition of a tertiary carbon?

Accepted Answer

A carbon atom bonded to three other carbon atoms

Question 6

Which of the following groups is represented by the abbreviation 't-Bu'?

Accepted Answer

Tert-butyl

Question 7

What is the molecular formula for octane?

Accepted Answer

$$C_8H_{18}$$

Question 8

Which of the following best describes a trans (E) alkene?

Accepted Answer

The highest priority groups on each carbon of the double bond are on opposite sides.

Question 9

Which of the following is NOT a rule for interpreting line-bond structures?

Accepted Answer

Hydrogen atoms attached to carbon are always drawn explicitly.

Question 10

Which of the following is a correct statement about aromatic rings?

Accepted Answer

Aromatic rings contain alternating single and double bonds in a ring structure.

Question 11

Which of the following is the correct condensed formula for propane?

Accepted Answer

$$CH_3CH_2CH_3$$

Question 12

Which of the following is a common error when classifying alkane carbons?

Accepted Answer

Applying primary, secondary, tertiary, and quaternary terms to sp$$^2 or sp $$carbons

Question 13

Which of the following is the correct IUPAC name for the structure $$CH_3CH_2CH_2CH_3$$?

Accepted Answer

Butane

Question 14

Which of the following statements about petroleum is TRUE?

Accepted Answer

About 30% of petroleum is composed of alkanes.

Question 15

Which of the following is the correct structure for isopropyl group?

Accepted Answer

$$-CH(CH_3$)_2$$

Question 16

Which of the following is a correct statement about alkynes?

Accepted Answer

Alkynes contain at least one $$C \equiv C$$ triple bond.

Question 17

Which of the following is the correct abbreviation for the phenyl group?

Accepted Answer

Ph

Question 18

Which of the following best describes the difference between cis (Z) and trans (E) alkenes?

Accepted Answer

Cis (Z) alkenes have the highest priority groups on the same side, while trans (E) alkenes have them on opposite sides.

Question 19

Which of the following is a correct statement about the environmental impact of petroleum?

Accepted Answer

CO$$_2$$ from burning petroleum made up about 25% of greenhouse gases in 2018.

Lecture Notes #3

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