JEE Advanced 2014 · Paper 1 · Chemistry Q21

ChemistryMultiple correct+3Question 21 of 60

The correct combination of names for isomeric alcohols with molecular formula $\ce{C4H10O}$ is/are

tert-butanol and 2-methylpropan-2-ol

tert-butanol and 1,1-dimethylethan-1-ol

n-butanol and butan-1-ol

isobutyl alcohol and 2-methylpropan-1-ol

Answer and worked solution

Official answer: A, C, D

(A) tert-Butanol is $\ce{(CH3)3COH}$ , which is 2-methylpropan-2-ol. Correct.
(B) "1,1-Dimethylethan-1-ol" is not a valid IUPAC name: the longest chain through the carbinol carbon has three carbons, so the name is 2-methylpropan-2-ol. Wrong.
(C) n-Butanol, $\ce{CH3CH2CH2CH2OH}$ , is butan-1-ol. Correct.
(D) Isobutyl alcohol, $\ce{(CH3)2CHCH2OH}$ , is 2-methylpropan-1-ol. Correct.

(A), (C), (D)

Topics:IUPAC nomenclature

JEE Advanced 2014 · Paper 1, Chemistry question 21