The correct IUPAC name is :

2, 3- dimethylenebutanal

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3- Methyl-2- methylenebut-3-enone

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3-Methyl-2-methylenebut-3-en-1-al

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2, 3-Dimethylenebutanone

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Solution

The correct option is C 3-Methyl-2-methylenebut-3-en-1-al
Aldehydes (-CHO)
Suffix: al/ carbaldehyde

Alkyl $(- C H_{3})$ and methylene group act as substituents while numbering.
Parent chain is of four carbon hence root word is butane.
so the correct IUPAC name is
3-Methyl-2-methylenebut-3-en-1-al

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