Amongst the following alcohols which would react fastest with conc. \(\mathrm{HCl}\) and \(\mathrm{ZnCl_2}\) ?
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- pentanol
- 2-methyl butanol
- 2-pentanol
- 2-methyl butan-2-ol
The Correct Option is D
Solution and Explanation
Pentanol and 2-methylbutanol (2-methylbutan-1-ol) are primary alcohols and would give primary carbocations - very slow.
2-Pentanol is secondary - moderate.
2-Methylbutan-2-ol, \(\mathrm{(CH_3)_2C(OH)CH_2CH_3}\), is tertiary - gives the most stable tertiary cation and reacts immediately (turbidity at once).
Answer: (4) 2-methyl butan-2-ol
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