C ₃ H ₆ (i) BH ₃; (ii) H ₂ O ₂/ NaOH P CrO ₃, anhydrous medium Q (i) CH ₃ MgBr ; (ii) H ₂ O R + Mg(OH)Br The organic compounds P, Q and R are

Step-by-step solution

The starting material C ₃ H ₆ is propene, CH ₃- CH = CH ₂ . Reaction with BH ₃ followed by H ₂ O ₂/ NaOH is hydroboration-oxidation, which results in the anti-Markovnikov addition of water across the double bond. This converts propene to 1-propanol. P = CH ₃- CH ₂- CH ₂- OH Oxidation of a primary alcohol with CrO ₃ in an anhydrous medium stops at the aldehyde stage, preventing further oxidation to a carboxylic acid. Thus, 1-propanol is oxidized to propanal. Q = CH ₃- CH ₂- CHO Propanal reacts with the Grignard reag