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AIIMS 2019 Chemistry IUPAC Nomenclature MCQ Question

Type: MCQ-conceptual-Medium-Class 11

In the given compound, chlorine is present on the first position, methyl group is present on the second position and nitro group is present on the fourth position as shown below. Therefore, IUPAC name of the compound is:

Question diagram
A

¹−Chloro−2−Methyl−4−nitrobenzene¹⁻Chloro^{-2}-Methyl^{-4}-nitrobenzene

B

¹−Methyl−2−Chloro−4−nitrobenzene¹⁻Methyl^{-2}-Chloro^{-4}-nitrobenzene

C

¹−Nitro−2−Chloro−4−methylbenzene¹⁻Nitro^{-2}-Chloro^{-4}-methylbenzene

D

¹−Chloro−4−Methyl−2−nitrobenzene¹⁻Chloro^{-4}-Methyl^{-2}-nitrobenzene

Correct Answer

Option A

Detailed Explanation

In the compound described, the chlorine (Cl) is located at the first position, the methyl (−CH₃) group at the second position, and the nitro (−NO₂) group at the fourth position on the benzene ring. According to IUPAC nomenclature, substituents are listed in alphabetical order regardless of their position, leading to the name ¹⁻Chloro−2o^{-2}-Methyl−4l^{-4}-nitrobenzene.

Option B incorrectly places the methyl group before the chloro group, while option C misidentifies the positions of the substituents. Option D incorrectly assigns the nitro group as being at the fourth position instead of the correct fourth position for the nitro group. Understanding the priority of substituents and their correct positions is crucial for accurate IUPAC naming.

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