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JEE Main Chemistry General Organic Chemistry 2026 JEE Main 2026 (22 January Shift 2)

JEE Main Chemistry Question (2026) — Solution

Question

The IUPAC name of the following compound is :

Options

  1. A. n-propyl-2-bromo-5-methylheptanoate
  2. B. n-propyl-1-bromo-4-methylhexanoate
  3. C. 2-bromo-5-methylpropanoate
  4. D. 2-bromo-5-methylhexylpropanoate

Answer

A. n-propyl-2-bromo-5-methylheptanoate

Step-by-step solution

The main functional group is an ester (COO-). The alcohol part is n-propanol, giving an n-propyl ester. For the acid part, identify the longest carbon chain: Starting from the carbonyl carbon (C1): C(=O)-CHBr (C2)-CH₂ (C3)-CH(with two methyls). The isopropyl group represents two methyl branches on C4. The longest continuous chain through the main skeleton and maximizing chain length is 7 carbons, making it a heptanoate. Numbering from the carbonyl: C1-C2(Br)-C3-C4-C5(methyl substituent)-C6-C7. Therefore, the IUPAC name is n-propyl 2-bromo-5-methylheptanoate.

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