The IUPAC name of the compound OHC-CH(CH₃)-C(=O)-CH=CH-CH₃ (drawn in skeletal form) is ______. 1. 5-formylhex-2-en-3-one 2. 5-methyl-4-oxohex-2-en-5-al 3. 3-keto-2-methylhex-5-enal 4. 3-keto-2-methylhex-4-enal

Answer: 4. 3-keto-2-methylhex-4-enal Key idea: the principal functional group is the aldehyde (-CHO), which gets C-1. Chain: OHC(1)-CH(CH₃)(2)-C(=O)(3)-CH(4)=CH(5)-CH₃(6) . This is a six carbon chain with: methyl at C-2, keto (oxo) at C-3 and a double bond at C-4. Name: 3-keto-2-methylhex-4-enal (option 4; the modern name is 2-methyl-3-oxohex-4-enal).

Topic: Nomenclature (trivial and IUPAC)· Some Basic Principles of Organic Chemistry

The IUPAC name of the compound OHC-CH(CH_3)-C(=O)-CH=CH-CH_3 (drawn in skeletal form) is ______.

The IUPAC name of the compound \(OHC-CH(CH_3)-C(=O)-CH=CH-CH_3\) (drawn in skeletal form) is ______.

skeletal structure of the compound

1. 5-formylhex-2-en-3-one

2. 5-methyl-4-oxohex-2-en-5-al

3. 3-keto-2-methylhex-5-enal

4. 3-keto-2-methylhex-4-enal

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Answer: 4. 3-keto-2-methylhex-4-enal

Key idea: the principal functional group is the aldehyde (-CHO), which gets C-1.

Chain: \(\mathrm{OHC(1)-CH(CH_3)(2)-C(=O)(3)-CH(4)=CH(5)-CH_3(6)}\). This is a six carbon chain with: methyl at C-2, keto (oxo) at C-3 and a double bond at C-4. Name: 3-keto-2-methylhex-4-enal (option 4; the modern name is 2-methyl-3-oxohex-4-enal).

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The IUPAC name of the compound OHC-CH(CH_3)-C(=O)-CH=CH-CH_3 (drawn in skeletal form) is ______.

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