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Preparation of Alkanes

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Preparation of Alkanes

Methods of Preparation:

Method Reactants → Conditions → Product
Catalytic hydrogenation of alkene \[\ce{\underset{Alkene}{C_{n}H_{2n}} + H2 ->[\underset{(room temp)}{Pt or Pd}][\underset{(high temp and high pressure)}{or Ni}] C_{n}H_{2n} + 2}\]
Catalytic hydrogenation of alkyne \[\ce{\underset{Alkene}{C_{n}H_{2n - 2}} + 2H2 ->[\underset{(room temp)}{Pt or Pd}][\underset{(high temp and high pressure)}{or Ni}] C_{n}H_{2n} + 2}\]
Reduction of alkyl halide \[\ce{CH3—I + \underset{Nascent}{2[H]} ->[Zn, HCI] CH4 + HI}\]
Wurtz Coupling reaction \[\ce{CH3 — Br + 2Na + CH3 — Br ->[Dry ether] CH3 — CH3 + 2NaBr}\]
From Grignard reagent

\[\ce{CH3 — Mg — I + H2O ->[Dry ether] CH4 + MgI(OH)}\]

Soda lime decarboxylation

\[\ce{RCOONa + NaOH ->[CaO/Δ] RH + Na2CO3}\]

Kolbe's electrolysis

\[\ce{2RCOONa + H2O ->[Electrolysis] R — R + 2CO2 + 2NaOH + H2}\]

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