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Identify D in the following sequence of reactions: $CH_3CH_2OH\xrightarrow{P+I_2}A\xrightarrow[dry\ ether]{Mg}B\xrightarrow{HCHO}C\xrightarrow{H_2O}D\ (major)$
Detailed Solution
$CH_3CH_2OH\xrightarrow{P+I_2}CH_3CH_2I$ (A); $CH_3CH_2I\xrightarrow{Mg,\ dry\ ether}CH_3CH_2MgI$ (B, Grignard reagent); $CH_3CH_2MgI$ reacts with HCHO to give an addition product, which on hydrolysis with $H_2O$ gives $CH_3CH_2CH_2OH$ (D, n-propyl alcohol, major product).