MCQ
The $IUPAC$ name of $\begin{matrix}
   C{{H}_{2}}-CH=CH-CHO  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   CHO\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}$ is
  • A
    propene $- 1, 3-$ dial
  • B
    Propene $-1, 3-$ dicarbaldehyde
  • C
    Pent $-3-$ ene $-1, 5-$ dial
  • Pent $-2-$ ene $-1, 5-$ dial

Answer

Correct option: D.
Pent $-2-$ ene $-1, 5-$ dial
d
Numbering should be done from right side beccause in this way, double bond will come at $C _2- C _3$ i.e., at least numbered $C$ - atom.

$\therefore$ IUPAC name: Pent $-2-$ ene $-1,5$ - dial

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