Question

question 8 (1 point)
the iupac name of compound ch₃c(ch₃)chch₃ is
a) 2 - methylbut - 3 - ene
b) 3 - methylbut - 2 - ene
c) 1 - methylbut - 2 - ene
d) 3 - methylbut - 3 - ene
e) 2 - methylbut - 2 - ene

Explanation:

• First, identify the longest carbon chain containing the double bond. Here, it is a 4 - carbon chain (but -).
• Then, number the chain to give the double bond the lowest possible number. The double bond is between carbon 2 and 3. But when we check the substituents, we want to give the methyl group the lowest possible number while also considering the double bond.
• The structure \(CH_3C(CH_3)CHCH_3\) can be rewritten as \(CH_3 - C(CH_3)=CH - CH_3\). The longest chain with the double bond is 4 carbons. Numbering from the end closest to the double bond (which also gives the methyl group the lowest number), the methyl group is on carbon 3.

Answer:

B. 3 - methylbut - 2 - ene