Question

iUPAC Name of CH3-CH = CH – CH – CHO

Answer 1

Given :

CH$_{3}$-CH = CH – CH – CHO

To Find :

The IUPAC nomenclature of CH$_{3}$-CH = CH – CH – CHO

Solution :

The IUPAC nomenclature of CH$_{3}$-CH = CH – CH – CHO is Pent-3-enal

Let us see how we named this compound -

• Numbering is done from that part where aldehyde group is present i.e., from right to left.
• Number of carbon atoms is 5 and so the name starts with 'pent'

• The double bonded carbon is in the 3rd position, so we have to mention its position.
• A '-' to be put between numbers and alphabet.

• As the compound is having an aldehyde group hence the name will end with 'al'.
• Hence the name Pent-3-enal.

Answer 2

The IUPAC name of the compound is Pent-3-enal.

Explanation:

1. The first step is to identify the parent chain. Here the parent chain is 5 carbon long, so the prefix Pent will be used.
2. The numbering will start from the right side because the lowest numbering is given to the aldehyde functional group as compared to the double bond.
3. Since aldehyde is the main functional group so the name will end with 'al'.
4. The name hence will be Pent-3-enal.