Question

The correct set of lowest locant for the given compound is .

• A. 2, 3, 5
• B. 2, 4, 5
• C. 2, 5, 4

Answer 1

The correct option is A 2, 3, 5

The position of methyl substituent in the given compound can be either 2, 3, 5 or 2, 4, 5 as shown below:


According to the lowest locant rule, the parent chain is numbered in such a fashion that the substituents takes up the lowest position. Here, the position of first substituent is same (2), for next substituents, 3< 4 so the correct set of locant is 2, 3, 5.