Question

Name the following structural formula

Answer 1

Understanding the rules for naming an organic compound:

• Identify the longest carbon chain in the compound.
• Branched carbons must get the lowest possible numbers.
• If different alkyl groups are present, they are listed in alphabetical order.
• If two or more substituent groups are present, then the numbers are separated by commas.
• If two substituent groups are in an equivalent position, the one which comes first in the alphabetical listing is given a lower number.
• Numbering to be done from the closer end of a substituent group, functional group, or double or triple bond.

Solutions:

First compound

• The longest chain has 7 carbon atoms
• We start numbering from the right-hand side (because of the double bond and substituent groups)

Ans: 3, 4 - dimethylhept-2-ene

Second compound

• The longest chain has 6 carbon atoms
• We can start numbering from any side (because the double bond is present in the middle)

Ans: hex-3-ene