question_answer

How many isomers can\[{{C}_{5}}{{H}_{12}}\]have?

A)  3                            

B)         2

C)  4                            

D)         5

E)  1

Correct Answer: A

Solution :

\[{{C}_{2}}{{H}_{12}}\]has three isomers. \[\underset{n-pentane}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}}}\,\] \[\underset{neo-pentane}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}}}}\,\]