Chemistry Alcohols & Phenols SET 2019
PMDC Verified Question 66 of 95
Choose a primary alcohol among the following
A
2-methyl-2-propanol
B
2,2-dimethyl-1-propanol
C
2-propanol
D
3-methyl-2-butanol
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 2,2-dimethyl-1-propanol
Concept:

A primary alcohol has its -OH group attached to a carbon atom that is bonded to at most one other carbon atom.

Formula:

$$ \text{R-CH}_2\text{OH} $$

Solution:

  • Look at the locant for the "-ol" suffix.


  • Option B is 2,2-dimethyl-1-propanol. The -OH is on C1, which is only bonded to C2. The heavy branching on C2 does not change the classification of the C1 alcohol. It is primary (specifically, neopentyl alcohol).


Why other options are incorrect:

Option A is tertiary (C2 has both OH and methyl). Option C is secondary. Option D is secondary (OH on C2, bonded to C1 and C3).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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