KVPY 2019 SA Exam Previous Papers

Question : 34 of 80

Marks: +1, -0

1-hydroxycyclohex-4-en-3-one
1-hydroxycyclohex-3-en-5-one
3-hydroxycyclohex-5-en-1-one
5-hydroxycyclohex-2-en-1-one

Solution:

Principal functional group is ketone.

∴

C_1

is carbonyl carbon atom.
Locants for hydroxyl groups and double bonds are 5 and 2, which are preferred over 3 and 5,
since the lower number at first difference (2 compared to 3) is preferred.

Hence, the IUPAC name of given compound is 5-hydroxycyclohex-2-en-1-one.

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