Question

Give IUPAC names of the following compound:

CH₃CH₂CH₂CH(Br)CH(CH₃)CH₂CHO

Options

• 3-Methyl-3-bromoheptanaldehyde

• 2-Methyl-3-bromoheptanal

• 2-Methyl-3-bromoheptanaldehyde

• 4-Bromo-3-methylheptanal

Answer 1

4-Bromo-3-methylheptanal

Explanation:

The IUPAC of the above compound will be more clear if we open up the structure:

The structure of the above compounds is (longest chain contain 7 carbon)

\[\begin{array}{cc}
\phantom{.......}\ce{Br}\phantom{....}\ce{CH3}\phantom{}\\
\phantom{.....}|\phantom{......}|\phantom{.}\\
\ce{\underset{7}{C}H3 - \underset{6}{C}H2 - \underset{5}{C}H2 - \underset{4}{C}H - \underset{3}{C}H - \underset{2}{C}H2 - \underset{1}{C}HO}
\end{array}\]

Hence the IUPAC name of the above compound is 4-Bromo-3-methylheptanal.