The major product formed when 3, 3- dimethyl butan -2- ol is heat… - Vidyadip

MCQ

The major product formed when $3, 3-$ dimethyl butan $-2-$ ol is heated with concentrated sulphuric acid is :

A
$2, 3-$ dimethylbut $-1-$ ene
✓
$2, 3-$ dimethylbut $-2-$ ene
C
$3, 3-$ dimethylbut $-1-$ ene
D
$C$ is and trans $-$ isomers of $2, 3-$ dimethylbut $-1-$ ene

✓

Answer

Correct option: B.

$2, 3-$ dimethylbut $-2-$ ene

$ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}\ \ \ \ \text{CH}_3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \ \ \ \ \ \ \ \ \ | \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}-\text{C}-\text{CH}_3\xrightarrow[(\text{conc.})]{\Delta,\ \text{H}_2\text{SO}_4}\text{H}_3\text{C}-\text{C}=\text{C}-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ _{(\text{Major product})}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ _{(2,3-\text{dimethylbut-2-ene})}\\ \ \ \ _{(3,3-\text{dimethyl, butan-2-ol})}$

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