Question 1

According to IUPAC nomenclature rules for alkanes, what is the correct order for naming a molecule with substituents?

Accepted Answer

location-substituent-parent

Question 2

When naming an alkane, what is the first step in determining its systematic name?

Accepted Answer

Find the longest continuous carbon chain

Question 3

If two different chains of equal length are present in an alkane, which chain should be chosen as the parent chain?

Accepted Answer

The chain with the most substituents

Question 4

How should you number the carbon chain when naming an alkane with multiple substituents?

Accepted Answer

From the end that gives the substituents the lowest possible numbers

Question 5

Which prefix should be used when there are three identical substituents on an alkane?

Accepted Answer

tri-

Question 6

When listing substituents in the name of an alkane, in what order should they appear?

Accepted Answer

In alphabetical order

Question 7

Which of the following is the correct systematic name for the molecule shown in the first practice problem (with substituents at positions 2, 6, and 4 on a nonane chain)?

Accepted Answer

2,6-dimethyl-4-propylnonane

Question 8

When naming a molecule with both tert-butyl and isopropyl substituents, which comes first in the name?

Accepted Answer

isopropyl

Question 9

What is the correct way to separate numbers from letters in an alkane name according to IUPAC rules?

Accepted Answer

Use a dash

Question 10

If a molecule has substituents at positions 3 and 5, both being methyl groups, what is the correct way to write this in the name?

Accepted Answer

$$3,5-$$dimethyl

Question 11

Which of the following is the correct systematic name for a molecule with a tert-butyl group at position 4, an isopropyl group at position 3, and a methyl group at position 2 on an octane chain?

Accepted Answer

3-isopropyl-4-tert-butyl-2-methyloctane

Question 12

If two substituents are equidistant from both ends of the parent chain, how do you decide which end to start numbering from?

Accepted Answer

Start from the end with the substituent that comes first alphabetically

Question 13

Which of the following is NOT a correct use of prefixes for identical substituents in alkane nomenclature?

Accepted Answer

mono-

Question 14

What is the parent chain in the molecule shown in the first example, and how many carbons does it have?

Accepted Answer

Heptane, 7 carbons

Question 15

Which of the following is the correct way to write the name for a molecule with substituents at positions 2, 4, and 6, all being methyl groups, on a heptane chain?

Accepted Answer

$$2,4,6-$$trimethylheptane

Question 16

If a molecule has substituents at positions 2-ethyl and 3-methyl on a pentane chain, what is the correct systematic name?

Accepted Answer

3-methyl-2-ethylpentane

Question 17

Which rule is used to determine the numbering direction when two substituents are at equal distances from both ends of the parent chain?

Accepted Answer

Alphabetical order of substituents

Question 18

In the name $$3-ethyl-5-methylheptane$$, which substituent is listed first and why?

Accepted Answer

Ethyl, because 'e' comes before 'm' alphabetically

Question 19

When drawing the structure for 4-tert-butyl-3-isopropyl-2-methyloctane, which carbon is the parent chain's starting point for numbering?

Accepted Answer

The end that gives the lowest numbers to the substituents

Question 20

Which of the following is a correct application of the IUPAC rule for separating numbers in alkane names?

Accepted Answer

Use commas to separate numbers

Systematic Naming of Alkanes: IUPAC Nomenclature

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