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(D) Step $1$: Reaction of isobutyl alcohol with $PBr_3$ gives isobutyl bromide: $(CH_3)_2CHCH_2OH + PBr_3 \rightarrow (CH_3)_2CHCH_2Br$.Step $2$: Reac

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$(CH_3)_2CHCH_2CH_2CH_2OH$

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(D) Step $1$: Reaction of isobutyl alcohol with $PBr_3$ gives isobutyl bromide: $(CH_3)_2CHCH_2OH + PBr_3 \rightarrow (CH_3)_2CHCH_2Br$.Step $2$: Reaction with $Mg$ in dry ether forms the Grignard reagent: $(CH_3)_2CHCH_2Br + Mg \rightarrow (CH_3)_2CHCH_2MgBr$.Step $3$: The Grignard reagent attacks ethylene oxide (epoxide) to form an alkoxide intermediate: $(CH_3)_2CHCH_2MgBr + C_2H_4O \rightarrow (CH_3)_2CHCH_2CH_2CH_2OMgBr$.Step $4$: Acidic hydrolysis $(H_3O^+)$ yields the final alcohol product: $(CH_3)_2CHCH_2CH_2CH_2OH$ ($4$-methylpentan$-1-$ol).

What is the major organic product of the following sequence of reactions?
$(CH_3)_2CHCH_2OH$ $\xrightarrow{PBr_3}$ $\xrightarrow{Mg}$ $\xrightarrow{C_2H_4O}$ $\xrightarrow{H_3O^+} ?$

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What is the major organic product of the following sequence of reactions?$(CH_3)_2CHCH_2OH$ $\xrightarrow{PBr_3}$ $\xrightarrow{Mg}$ $\xrightarrow{C_2H_4O}$ $\xrightarrow{H_3O^+} ?$