3, 3-Dimethyl-2-butanol cannot be prepared by | vedclass

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(B) The target molecule is $3, 3-$dimethyl$-2-$butanol, which has the structure $(CH_3)_3C-CH(OH)-CH_3$.$A$. Reaction of $3, 3-$dimethylbutanal with $

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$B$ and $E$ only

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(B) The target molecule is $3, 3-$dimethyl$-2-$butanol, which has the structure $(CH_3)_3C-CH(OH)-CH_3$.$A$. Reaction of $3, 3-$dimethylbutanal with $MeMgBr$ followed by $H_3O^+$ gives $3, 3-$dimethyl$-2-$butanol. This is a valid preparation.$B$. Acid-catalyzed hydration of $3, 3-$dimethyl$-1-$butene involves a carbocation rearrangement (ethyl shift) to form a more stable carbocation, leading to $2, 3-$dimethyl$-2-$butanol, not the target alcohol. Thus, $B$ cannot prepare it.$C$. Ozonolysis of $2, 3, 4, 4-$tetramethyl$-2-$pentene followed by reduction with $NaBH_4$ yields $3, 3-$dimethyl$-2-$butanol and acetone. This is a valid preparation.$D$. Reduction of $3, 3-$dimethyl$-2-$butanone with $LiAlH_4$ gives $3, 3-$dimethyl$-2-$butanol. This is a valid preparation.$E$. Hydration of $3, 3-$dimethyl$-1-$butyne with $Hg^{2+}/H^+$ gives $3, 3-$dimethyl$-2-$butanone, not the target alcohol. Thus, $E$ cannot prepare it.Therefore, $B$ and $E$ cannot be used to prepare the target alcohol.

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