Question

IUPAC name of the compound is

• A. 2, 3 – dimethylbut-2-ene
• B. 2, 3 – dimethyl butyne
• C. 1, 1, 2, 2 – tetra methylethene
• D. 2, 3 – dimethyl butene

Answer 1

The Correct Option is A

The structure \(\c{>C=C<}\) shows two double-bonded carbons, each directly connected to two alkyl substituents. For correct IUPAC nomenclature:

• Identify the longest carbon chain containing the double bond (four-carbon chain = "but-").
• Number the carbon chain giving the double bond the lowest possible number ("2-ene").
• Two methyl groups attached at carbons 2 and 3 give us the substituents "2,3-dimethyl".

This leads to the correct IUPAC name: 2,3–dimethylbut-2-ene. 

Conclusion:

The correct answer is Option A: 2,3–dimethylbut-2-ene.

Answer 2

The structure provided shows a compound with a double bond between two carbon atoms, and two methyl groups (\( \text{CH}_3 \)) attached to the second and third carbon atoms of a butene backbone.

- The longest chain in the compound is 4 carbons, which is butene.
- The double bond is at the second position, which is indicated by "but-2-ene".
- The methyl groups are attached to the second and third carbon atoms, making it "2, 3 - dimethyl".
 
Thus, the IUPAC name of the compound is 2, 3 - dimethylbut-2-ene.