Primary alcohol is mainly formed in which of the following reactions?

  • A
    $CH_3-CH=CH_2 \xrightarrow{H_3O^{\oplus}}$
  • B
    $CH_3-CH=O \xrightarrow[(2) \, H_2O]{(1) \, CH_3MgBr}$
  • C
    $CH_3-CH=CH_2 \xrightarrow[(2) \, H_2O_2/\overset{\Theta}{O}H(aq.)]{(1) \, BH_3, THF}$
  • D
    None of these

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In the given reaction,identify $R$ in $RMgBr$:
$CH_3CH_2CHO \xrightarrow[2. H_3O^+]{1. RMgBr} CH_3CH_2CH(OH)CH_2CH_3$

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