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(B) The starting material is $3,3$-dimethylbutan-$2$-ol.When treated with concentrated $H_2SO_4$ and heated,it undergoes acid-catalyzed dehydration.St

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

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(B) The starting material is $3,3$-dimethylbutan-$2$-ol.When treated with concentrated $H_2SO_4$ and heated,it undergoes acid-catalyzed dehydration.Step $1$: Protonation of the $-OH$ group to form a good leaving group $(-OH_2^+)$.Step $2$: Loss of water to form a secondary carbocation: $(CH_3)_3C-CH^+-CH_3$.Step $3$: The secondary carbocation undergoes a $1,2$-methyl shift to form a more stable tertiary carbocation: $(CH_3)_2C^+-CH(CH_3)_2$.Step $4$: Elimination of a proton from the adjacent carbon atom to form the most stable alkene (Saytzeff product).The most stable alkene is $2,3$-dimethylbut-$2$-ene,which is a tetrasubstituted alkene.Therefore,the major product is $2,3$-dimethylbut-$2$-ene.

Identify the major product of the following reaction:
$(CH_3)_3C-CH(OH)-CH_3 \xrightarrow[\Delta]{\text{conc. } H_2SO_4} \text{Major product}$

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Identify the major product of the following reaction:$(CH_3)_3C-CH(OH)-CH_3 \xrightarrow[\Delta]{\text{conc. } H_2SO_4} \text{Major product}$