Question

28
multiple choice 2 points
use the iupac rules to write the name of the given compound.
2,5 - dimethylhexa - 2,4 - diene
1,1,4,4 - tetramethylbuta - 1,3 - diene
3,6 - dimethylhexa - 2,4 - diene
2,5 - dimethylhexa - 3,6 - diene
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Explanation:

Step1: Determine the parent chain

The parent chain is a six - carbon chain (hexa) with two double bonds (diene).

Step2: Locate the double bonds

The double bonds are at positions 2 and 4.

Step3: Identify the substituents

There are two methyl groups at positions 2 and 5.

Step4: Check other options

• Option B: 1,1,4,4 - tetramethylbuta - 1,3 - diene has a four - carbon parent chain, which is incorrect as the given structure has six carbons.
• Option C: 3,6 - dimethylhexa - 2,4 - diene has incorrect methyl group numbering (lower numbers for substituents are preferred).
• Option D: 2,5 - dimethylhexa - 3,6 - diene has incorrect double - bond numbering (lower numbers for double bonds are preferred).

Answer:

A. 2,5-dimethylhexa-2,4-diene