Chemistry, asked by azhrataif04, 1 year ago

write the molecular formula of the 2nd and the third member of homologous series whose first member is methane.

Answers

Answered by IIcherryII
1
c2h6 second member
c3h8 third member
Answered by kavita9612
2
Homologous series describes organic chemical compounds that have similar structure that only differ by the number of carbon and hydrogen atom that are contained in the main carbon chain.

Methane belongs to the homologous series known as alkanes and it is the simplest of the organic chemical compounds that are in this series.

The alkanes have a general formula of  CₐH₂ₐ₊₂ .  Where 'a' represents the number of carbon atoms that are in each molecule of the alkane compound, and that are bonded by single bonds to each other and the hydrogen atoms.

You can use the formula CₐH₂ₐ₊₂ to find the second, third, fourth compound of this homologous series, and so on...

The second compound is:  a = 2

Therefore CₐH₂ₐ₊₂ = C₂H₍₂ₓ₂₎₊₂   
                =   C₂H₆(ethane)

The third compound will be: (where a = 3)

 CₐH₂ₐ₊₂ = C₃H₍₂ₓ₃₎₊₂

=    C₃H₈(propane)

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