CBSE Class 10 Science 2015 Term II Delhi Set 2

Question : 8 of 11

Marks: +1, -0

What is meant by isomers? Draw the structures of two isomers of butane,

{\C}_4 {\H}_{10}

. Explain why we cannot have isomers of first three members of alkane series

Solution:

Isomers are compounds which have the same molecular formula but different structures.

{{\H}- {\C}↖{|↖{\H}}↙{|↙{\H}}- {\C}↖{|↖{\H}}↙{|↙{\H}}- {\C}↖{|↖{\H}}↙{|↙{\H}}- {\C}↖{|↖{\H}}↙{|↙{\H}}- {\H}}↙{↙{\text "n- butane"}}

{ {\H}- {\C}↖{|↖{\H}}↙{|↙{\H}}- {\C}↖{|↖{\H}}↙{|↙{\H-\C↙{|↙{\H}}-\H}}- {\C}↖{|↖{\H}}↙{|↙{\H}}- {\H}}↙{\text "Iso butane"}

Since branching is not possible in first 3 members thus isomers of these first members of alkane series is not possible.

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