Question

in alkane group... we have CH4 i.e.methane then why alkene and alkyne has methene and methyne? why do they start from ethene and ethyne?

Answer 1

In alkane group carbon valency is satisfied with four hydrogen atoms as its general formula is CnH2n+2
But in case of alkene and alkyne groups carbon valency is not satisfied with two hydrogen atoms so it's valency is not fulfilled
So alkene and alkyne groups starts with ethene and ethyne which valency is fulfilled with covalent bonding
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