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Why alkene starts from 2 carbon

Answer» Because in alkene there must be double bond (as per need) .. and it is not possible for one carbon to form double bond with hydrogen as hydrogen can form only single bond so there must be the need of 2 carbon atoms to form double bond...
alkene starts from two carbons because in the structruce of alkene the carbon need to 4 bonds and threre are available only 2 hydrogen
Because for forming a double bond atleast 2 carbon atoms are required......C=C....
Because in alkane and alkyne there is double or triple bond necessary between 2 carbon atoms ☺


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