But-2-en-1-ol is the IUPAC name of :

C H_{3} - C H = C H - C H O

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C H_{2} = C H - C H_{2} - C H_{2} - O H

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C H_{3} - C H = C H - O H

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C H_{3} - C H = C H - C H_{2} - O H

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Solution

The correct option is D $C H_{3} - C H = C H - C H_{2} - O H$
But-2-en-1-ol is the IUPAC name of $C H_{3} - C H = C H - C H_{2} - O H$ .
The numbering will start from the carbon directly attached to the oxygen of the alcohol group and the second carbon is a doubly bonded carbon.

Option D is the correct answer.

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