Heptane has 9 isomer, Octane 18 and Decane 75.
Preparation:- 1. Wurtz reaction:-
2CH3 CH2Br2Na
Dry ether
CH3 CH2CH2CH3
� Follow mainly free radical mechanism
� An alkaline containing useful in preparing even number of carbon atom � Stepping up reaction Frankland reaction
RX + Zn + Rx
R – R + ZnX2
2. From Grignard reagent( RMgX)
RMgX + HOH RMgX + R ' OH RMgX + R ' NH2
RH + Mg( OH) X RH + Mg( OR ') X
RH + Mg( NHR ') X