JEE MainChemistryGeneral Organic Chemistry
Which of the following sets of relative positions correctly describes the structure of 4-methylcyclohex-2-en-1-ol? (Assume the positions refer to an arbitrary sequential numbering of the six-membered ring).
Options
- AA hydroxyl group at C1, a double bond between C2 and C3, and a methyl group at C6.
- BA hydroxyl group at C1, a double bond between C2 and C3, and a methyl group at C4.
- CA hydroxyl group at C1, a double bond between C3 and C4, and a methyl group at C4.
- DA double bond between C1 and C2, a hydroxyl group at C2, and a methyl group at C4.
Correct answer
B. A hydroxyl group at C1, a double bond between C2 and C3, and a methyl group at C4.
Step-by-step solution
To determine the structure from the IUPAC name 4-methylcyclohex-2-en-1-ol, we break down the name into its components: 1. Root word and primary prefix: 'cyclohex' indicates a six-membered carbon ring. 2. Principal functional group (Secondary suffix): '-1-ol' indicates a hydroxyl ( -OH ) group attached to carbon-1. 3. Unsaturation (Primary suffix): '-2-en' indicates a double bond starting at carbon-2 (i.e., between C2 and C3). 4. Substituent (Secondary prefix): '4-methyl' indicates a methyl ( -CH₃ ) group attached t