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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm080

Select the correct IUPAC names.

AThe compound $CH X_{2} = CH - CH X_{2} - CH X_{2} - OH$ is but-3-en-1-ol.
BThe compound $CH X_{2} = C (CH X_{3}) - CH X_{2} - OH$ is 2-methylprop-2-en-1-ol.
CThe compound $CH X_{3} - CH (OH) - CH = CH - CH X_{3}$ is pent-3-en-2-ol.
DThe compound $CH X_{3} - CH = CH - CH X_{2} - CH X_{2} - OH$ is pent-2-en-5-ol.

Answer: A, B, C

The OH takes the lowest locant first.

CH X_{2} = CHCH X_{2} CH X_{2} OH

is but-3-en-1-ol (true).

CH X_{3} CH (OH) CH = CHCH X_{3}

numbered from the left gives OH at 2 and C=C at 3, so pent-3-en-2-ol (true).

CH X_{2} = C (CH X_{3}) CH X_{2} OH

is 2-methylprop-2-en-1-ol (true).

CH X_{3} CH = CHCH X_{2} CH X_{2} OH

is pent-3-en-1-ol, not pent-2-en-5-ol (false).

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