A) 5
B) 2
C) 3
D) 4
Correct Answer: A
Solution :
Key Idea: Draw the structure, name them and count them.\[{{C}_{6}}{{H}_{14}}-\] hexane. (i)\[C{{H}_{3}}-\underset{\text{hexane}}{\mathop{C{{H}_{2}}}}\,-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\] (ii) \[C{{H}_{3}}-\underset{2-\text{mehtyl}\,\text{pentane}}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}-C{{H}_{2}}}}\,-C{{H}_{3}}\] (iii) \[\underset{3-\text{methyl}\,\text{pentane}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}-C{{H}_{3}}}}\,\] (iv) \[\underset{2,2-\text{dimethyl}\,\,\text{butane}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-C{{H}_{3}}}}\,\] (v) \[\underset{2,3dimethyl\,butane}{\mathop{C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-C{{H}_{3}}}}\,\] \[\therefore \]Total of 5 isomeric hexanes are possible.
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