Q22E-e - Organic Chemistry (Mcmurry)

Question

Name the following alkyl halides:

Step-by-Step Solution

Answer

The name of the compound (e) is 1-bromo-6-chloro-2-hexyne.

Step 1: Alkyl Halides

Alkyl halides are also known as haloalkanes or halogenoalkanes. They contains one or more halogen substituents i.e. –Br, -Cl,-I,-F.

Step 2: Rules for nomenclature of Alkyl halides

IUPAC rules used for naming of Alkyl halides

• Select longest carbon chain, it is the parent chain;
• Longest chain must contain double or triple bond, if present;
• Number the alkyl or halo substituent carbon i.e. it should possess lowest number in the parent chain;
• Assign a number to each substituent;
• Write the name of substituent’s in alphabetical order while naming.

Step 3: Naming of given alkyl halide

• The longest chain i.e. parent chain is having six carbon atoms with one triple bond, so it is a hexyne.
• Two types of constituents are present i.e. bromo and chloro.
• Substituents are written in alphabetical order and with lowest possible numbering.
• Preference will be given to triple bond.
• So, the name of the compound is 1-bromo-6-chloro-2-hexyne.