page 8

Question 1

What is the first step in naming an alkyl halide?

Answer 1

Answer: Identify the longest continuous carbon chain that includes the carbon bonded to the halogen.

Question 2

How do you number the parent chain?

Answer 2

Answer: Start numbering from the end nearest to the first substituent, whether it is an alkyl or halogen group.

Question 3

Why does chlorine get the number 2 in this example?

Answer 3

Answer: Numbering starts from the left to ensure the halogen gets the lowest possible position.

Question 4

Which comes first in the name, “chloro” or “methyl,” and why?

Answer 4

Answer: Chloro comes first because substituents are listed in alphabetical order.

Question 5

Summary of IUPAC Rules for Alkyl Halides

Answer 5

Find the longest chain containing the halogen.
Number the chain starting closest to the first substituent.
Name and number the substituents.
Alphabetize the substituents and assemble the name.