The structure shown in the figure is to be named by IUPAC rules. Which name is correct? 
A3-methylbut-2-en-1-ol
B2-methylbut-3-en-1-ol
C2-methylbut-2-en-4-ol
D3-methylbut-1-en-2-ol
Answer & Solution
Correct answer: A. 3-methylbut-2-en-1-ol
The parent chain has 4 carbons and includes the $-OH$ group, so the root is but-. Numbering starts from the end nearer the principal functional group, giving $-OH$ locant 1 and the double bond at 2. The methyl substituent then falls at carbon 3, so the correct name is 3-methylbut-2-en-1-ol.
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