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Write the IUPAC names of the following structural formulae.

CH3 – CH2 – CH2 – CHO

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The number of carbon atoms in the longest chain: 4

Parent alkane : Butane 

Functional group: -CHO (al)

Assign the number: 1

Assign the number ‘1’ to carbon in the functional group

If the carbon chain of the compound contains a -CHO group then change the ending of the parent name, i.e. ‘e’ of the butane is replaced by ‘al’.

Parent suffix: Butanal 

IUPAC name: Butanal

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