Q. How many isomers can $ {{C}_{5}}{{H}_{12}} $ have?
KEAMKEAM 2000
Solution:
$ {{C}_{2}}{{H}_{12}} $ has three isomers. $ \underset{n-pentane}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}}}\, $
$ \underset{neo-pentane}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}}}}\, $
