Question

how many methylene group ( -CH2- )units are present in propene ?

Answer 1

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Propene is an alkene with 3 Carbon atoms

Its structure is :-

CH3_CH=CH2

So.......

It has one CH2 unit

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Answer 2

The chemical formula of propene is  

 CH₂=CH-CH₃

Its IUPAC name is prop-1-ene.

It contains one –CH₂ group, one –CH group, one –CH₃ group and one double bond. Hence, propene contains one (-CH₂) methylene units. Its molecular formula is C₃H₆ and its molar mass 42.081 g/mol.