The IUPAC name of CH3-CO-CH=CH-CH2-OH is:

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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm103

The IUPAC name of $CH X_{3} - CO - CH = CH - CH X_{2} - OH$ is:

A5-hydroxypent-2-en-4-one
B4-oxopent-2-en-1-ol
C1-hydroxypent-2-en-4-one
D5-hydroxypent-3-en-2-one

Answer: D

Ketone outranks alcohol, so -one is the suffix and gets the lowest locant: numbering from the CH3 end puts C=O at C-2, while the other end would give C-4. The C=C is then C-3=C-4 and the OH is a prefix on C-5. The name is 5-hydroxypent-3-en-2-one.

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The IUPAC name of CHX3​−CO−CH=CH−CHX2​−OH is:

Answer: D

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The IUPAC name of $CH X_{3} - CO - CH = CH - CH X_{2} - OH$ is: