Q. Which is the correct structure of compound -bromo-- chloro--ethoxycarbonyl--methyl heptanoic acid?

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Solution:

The correct numbering of given compound is as follows: is here the functional group of highest priorty.
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Ethoxy carbonyl is prefix for the ester locant.
Carbon of ester group is not considered in parent chain as it would give a parent chain of six carbons only.