Question 1

Which of the following best describes a skeletal structure in organic chemistry?

Accepted Answer

It shows bonds between carbon atoms as lines, omits hydrogen atoms bonded to carbon, and displays other atoms using their symbols.

Question 2

Which statement about alkanes is TRUE?

Accepted Answer

Alkanes are saturated hydrocarbons containing only single bonds between carbon atoms.

Question 3

What is the general molecular formula for a straight-chain alkane with $$n$$ carbon atoms?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n+2}$$

Question 4

Which of the following is a correct IUPAC name for a branched-chain alkane with a methyl group on the second carbon of pentane?

Accepted Answer

2-methylpentane

Question 5

Which functional group is present in all members of the alkene family?

Accepted Answer

Carbon-carbon double bond

Question 6

A molecule with the formula $$\mathrm{C}_5\mathrm{H}_{12}$$ can have several isomers. What type of isomerism is present when two molecules have the same molecular formula but different connectivity of atoms?

Accepted Answer

Structural isomerism

Question 7

Which of the following statements about cycloalkanes is CORRECT?

Accepted Answer

Cycloalkanes are ring-form alkanes named by adding the prefix 'cyclo' to the alkane name.

Question 8

Which of the following is a property of alkanes that affects their behavior in water?

Accepted Answer

Alkanes are nonpolar and do not mix well with water.

Question 9

Which of the following is a correct condensed structural formula for butane?

Accepted Answer

$$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$$

Question 10

Which of the following is a correct description of a chiral center in an organic molecule?

Accepted Answer

A carbon atom bonded to four different atoms or groups.

Question 11

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

Accepted Answer

It is possible because the carbon-carbon double bond restricts rotation.

Question 12

Which of the following is a correct IUPAC name for a cycloalkane with a chlorine substituent on carbon 1 of cyclopentane?

Accepted Answer

1-chlorocyclopentane

Question 13

Which of the following statements about aromatic compounds is CORRECT?

Accepted Answer

Aromatic compounds have alternating single and double bonds in a ring, with electrons shared evenly among the carbons.

Question 14

Which of the following is a correct molecular formula for cyclohexane?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}$$

Question 15

Which of the following is a correct description of a functional group in organic chemistry?

Accepted Answer

A group of atoms bonded in a particular way that determines the chemical reactivity of a molecule.

Question 16

Which of the following is a correct statement about the combustion of alkanes?

Accepted Answer

Combustion of alkanes produces carbon dioxide and water.

Question 17

Which of the following is a correct IUPAC name for a haloalkane with a bromine atom on the third carbon of hexane?

Accepted Answer

3-bromohexane

Question 18

Which of the following statements about enantiomers is TRUE?

Accepted Answer

Enantiomers are nonsuperimposable mirror images.

Question 19

Which of the following is a correct description of a polyunsaturated fatty acid?

Accepted Answer

A fatty acid with two or more double bonds in its carbon chain.

Question 20

Which of the following is a consequence of chirality in pharmaceuticals?

Accepted Answer

Only one enantiomer may be biologically active, while the other can be inactive or harmful.

Introduction to Organic Compounds: Structure Representation

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