Give the IUPAC name of the following: $C H_{3} C H_{2} CHO$ .

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Propan-1-al

Propan-1-ol

Prop-1-al

Pro-1-panal

answer is A.

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Detailed Solution

Concept- The compounds with ‘

CHO

’ group are aldehydes and their name ends with ‘al’.
IUPAC rules for naming aldehydes are:
●       The name of an aldehyde ends with “al”.
●       Choose the longest carbon chain for the root name.
●       Number the carbon atoms on this longest chain such that the carbon of -

CHO

the group gets the lowest number.
●       Identify the other substituents and their position.
●       If the same substituent appears more than once, then the prefix (di, tri, tetra) is used to indicate their frequency.
●       If there are more than 2 substituents, they are named in alphabetical order with the position written ahead of them.
Thus, using the above rules, the given compound is named propan-1-al as ‘prop’ represents 3 carbon atoms.
Hence, the correct option is (1).

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