Methods involved in preparation of hydrocarbon - definition
1.Hydrogenation : it is addition of hydyrgen on multiple bond 2.Decarboxylation: loss of CO2 3. Reduction : addition of hydrogen 4.Addition: 5.Substitution
Alkane preparation from unsaturated hydrocarbon - definition
In this process hydrogen is added to unsaturated compound in presence of a catalyst . Example : CH2=CH2+H2(g)→CH3−CH3
Method of preparation alkanes from alkyl halide - definition
Alkyl halides can converted into alkanes by one of the following methods : 1. Through Grignard Reagents : Alkyl halides especially , bromides and iodides react with magnesium metal in presence of diethyl ether to form alkyl magnesium halides.which is further hydrolyzed by water to form alkane. 2.Wurtz Reaction : When an alkyl halide is treated with metallic sodium in presence of dry ethyl ether , a symmetrical alkane is formed. Example : CH3CH2Cl+2Na+CH3CH2Cl→CH3CH2CH2CH3+2NaCl
Alkanes from Carboxlic acid - definition
Alkanes can be prepared by decarboxylation that is removal of CO2 gas by two methods. 1.Decarboxylation : when a carboxylic acid is heated with soda lime at about 630 K, a molecule of CO2 is lost and alkane is formed. 2. Kolbe's eectrolytic method : When a concentrated aqueous solution of the sodium or potassium salt of a monocarboxlic acid is electrolyzed, an alkane is produced.