1.

Table of no. of carbon atoms and no. chain isomerism​

Answer»

One CARBON

​  

:− One carbon does not really form chains, So, there is no chain or position isomerism,  

                           CH4

 (methane) has one carbon.

Two carbons

:− Two carbOn form a chain, but there is only one way to form this chain, so no isomerism as WELL.

                           CH3-CH3

 (ethane) has two carbons.

Three carbons

:− One carbon has to be in the MIDDLE and the other two at the ends, so only one possible chain, no isomerism.

                           CH3-CH2-CH3

 (propane) has three carbons.

Four carbons

:− One carbon has to be in the middle, two at the ends, but the fourth carbon could be in the middle (forming isobutane) or at the end (forming n− butane), so there is a chain as well as position isomerism.

See the FIGURE.  

So the minimum numbers of carbon are 4.


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