When naming polyenes (compounds with multiple double bonds), the alphabet 'a' is appended to the word root. Which of the following is the correct IUPAC name for ?

Question

When naming polyenes (compounds with multiple double bonds), the alphabet 'a' is appended to the word root. Which of the following is the correct IUPAC name for $CH_2=CH-CH=CH_2$?

Prashant Kotian · Accepted Answer

Correct answer: C. The parent chain has 4 carbons with two double bonds. The word root 'But' becomes 'Buta' when followed by the consonant 'd' in 'diene'. The double bonds are at C1 and C3. Thus, Buta-1,3-diene.

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