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Question

Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques

The number of isomeric hexanes is:

A

5

B

2

C

3

D

4

Answer

5

Explanation

Solution

Draw the structure, name them and count them. C6H14−{{C}_{6}}{{H}_{14}}- hexane. (i) CH3−CH2hexane −CH2−CH2−CH2−CH3C{{H}_{3}}-\underset{\text{hexane}}{\mathop{C{{H}_{2}}}}\,-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}} (ii) CH3−C∣ CH3 H−CH2−CH22−mehtyl pentane −CH3C{{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) CH3−CH2−C∣ CH3 H−CH2−CH33−methyl pentane \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) CH3−CH2−C∣∣ CH3CH3 −CH32,2−dimethyl  butane \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) CH3−C∣ CH3 H−C∣ CH3 H−CH32,3dimethyl butane \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.