In the case of HOCH2CH2CH2COOH, from where is numbering started?
Correct answer: B. Carboxylic acid is given number 1 position
- A. OH group is given number 1 position
- B. Carboxylic acid is given number 1 position
- C. COOH is given number 3 position
- D. COOH is given number 4 position
Explanation
Option B: This is because it is first in the priority order.Option A) OH group is given number 1 position is incorrect because the -OH group is not the highest priority functional group in this molecule. Therefore, it should not be used to determine the numbering.Option C) COOH is given the number 3 position and Option D) COOH is given the number 4 position are both incorrect because they do not follow the IUPAC nomenclature rules. According to these rules, the carboxylic acid group should be given the number 1 position, and the numbering should proceed in such a way that all other functional groups receive the lowest possible number.
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About Carboxylic Acids
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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