The IUPAC name of crotonaldehye is

Propanal

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But-2-en-1-al

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But-1-en-2-al

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Pent-2-en-1-al

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Solution

The correct option is B But-2-en-1-al
Crotonaldehyde is $C H_{3} C H = C H C H O$
Its, IUPAC name is But-2-en-1-al

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