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Question

The IUPAC name of

CH3−CH|CH3−C|CH3−CH|CHO−CH2−CH2−CH3 is?


A

,2-Dimethy(propyl)pentanal

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B

3,4-Dimethy-2-propylpentanal

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C

4-Formyl-2,3-dimethylheptane

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D

None of the above

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Solution

The correct option is B

3,4-Dimethy-2-propylpentanal


Although the longest chain from either end is 7-carbons long, the correct way to start numbering is from the aldehyde -CHO carbon.
This leaves us with two options.


When there are two or more longest chains, we choose to number in such a way that then are maximum number of substituents.

Option I is more appropriate as it has 3 substituents compared to option II, which has only one substituent at C2.

Word root = pent
Primary suffix = ane
Secondary suffix = al
Secondary prefix = 3,4-dimethyl-1,2-propyl

Alphabetically 3,4 - dimethyl precedes 2-propyl hence the answer is 3,4-Dimethyl-2-propylpentanal


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