Question

Correct IUPAC name of compound is :
1,2-dimethyl cyclobutene
(B) 2,3-dimethyl cyclobutene
1.2-dimethyl cyclobut-2-ene
(D) 1,4-dimethyl cyclobutene​

Answer 1

Answer:

I think it 2,3-dimethyl cyclobutene.... ,ie, opt B

Answer 2

Answer:

The correct IUPAC name for the given compound is 1,4-dimethyl cyclobutene.

Explanation:

The rules for IUPAC nomenclature are as follows:

• The longest chain chosen for the root name must have both the double bond carbon atoms.
• The root chain must be numbered from the end nearest a double bond carbon atom.
• The smallest among the two numbers indicating the carbon atoms of the double bond is used as the double bond locator.
• In cycloalkenes the double bond carbons are given ring locations 1 and 2. Which of the two is 1 is determined by the nearest substituent rule.

Here, the longest carbon chain including the double bonds is of 4 carbon atoms, i.e., butene.

Since it is a cycloalkene, the carbon atom having a methyl group is numbered #1. Therefore, the other branched carbon atom is numbered #4.

Therefore, the IUPAC nomenclature is 1,4-dimethyl cyclobutene.

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