IUPAC name for cinnamaldehyde is:

3–Phenylprop–2-en–1–al

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1–Phenylprop-1-al

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2–Phenylprop–2-en–1–al

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1–Phenylprop–2–en–3–al

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Solution

The correct option is A 3–Phenylprop–2-en–1–al
In cinnamaldehyde, principal functional group is aldehyde so the numbering starts from it.

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