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The IUPAC name of:

1. 2 -methyl-3-bromo hexanal
2. 3-bromo-2-methyl butanal
3. 2 -bromo-3-bromo butanal
4. 3-bromo-2-methyl pentanal

Correct answer: 2 -methyl-3-bromo hexanal

Solution

The parent chain must include the aldehyde carbon and be the longest possible, which gives a six-carbon aldehyde: hexanal. Numbering from the CHO carbon places the substituents at C2 and C3, giving 2-methyl and 3-bromo.

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