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

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Butan-1-al

Butan-1-ol

But-1-al

Bu-1-tanal

answer is A.

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Detailed Solution

Concept-

The compounds that have ‘ $CHO$ ’ group are aldehydes and their name ends with ‘al’.
IUPAC rules for naming aldehydes are:
●       The suffix for an aldehyde is “al”.
●       Select the longest carbon chain for the root name.
●       Number the carbon atoms on this longest chain such that the carbon of - $CHO$ 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 Butan-1-al as ‘butan’ and represents 4 carbon atoms.