Question

The correct IUPAC name of the following compound is:

Fig.

• A. 4-methyl-2-nitro-5-oxohept-3-enal
• B. 4-methyl-5-oxo-2-nitrohept-3-enal
• C. 4-methyl-6-nitro-3-oxohept-4-enal
• D. 6-formyl-4-methyl-2-nitrohex-3-enal

Answer 1

The Correct Option is C

Fig.

To determine the correct IUPAC name of the given compound, follow these steps:

1. Identify the longest carbon chain: The longest carbon chain in the compound is seven carbons long, making it a heptane derivative.
2. Identify and Number the substituents:
   • The main functional group here is an aldehyde, given by the formyl group (−CHO) at the end of the chain.
   • Starting from the end closest to the aldehyde group, the substituents in this compound are:
     • 6-nitro group (NO₂) at position 6
     • 4-methyl group (CH₃) at position 4
     • 3-oxo group (=O) at position 3 (keto group)
     • Double bond between carbon 4 and carbon 5.
3. Form the compound name:
   • Since substituents are named with prefixes and arranged alphabetically, the nitro group will come first followed by the methyl group.
   • Add the location of the double bond and the suffix for the aldehyde group.
   • Based on the above analysis, the full name is: 4-methyl-6-nitro-3-oxohept-4-enal.

Thus, the correct IUPAC name for the compound is 4-methyl-6-nitro-3-oxohept-4-enal.