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Write the IUPAC names of the following structural formulae.

CH3 – CH2 – CH = CH2

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Number of carbon atoms in the longest chain: 4

Parent alkane: Butene

Functional group: double bond

Assign the number:

In the longest chain, the numbering of carbon atom starts from the carbon atom nearest to the double bond and the other c-atoms are numbered accordingly.

Parent suffix: But-1-ene 

IUPAC name: But-1-ene

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