A) \[\underset{\text{3-methyl-2 butanol}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{CH}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}}}\,\]
B) \[\underset{\text{4-methyl-2-pentyne}}{\mathop{C{{H}_{3}}-C\equiv C}}\,-CH{{(C{{H}_{3}})}_{2}}\]
C) \[\underset{\text{2-ethyl-3 methyl-but-1-ene}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\underset{\begin{smallmatrix} || \\ C{{H}_{2}} \end{smallmatrix}}{\mathop{C}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}}}\,\]
D) \[\underset{\text{3-methyl-4 ehtyl heptane}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ C{{H}_{2}}C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}C{{H}_{3}}}}\,\]
Correct Answer: D
Solution :
\[C{{H}_{3}}-\overset{6}{\mathop{C}}\,{{H}_{2}}-\overset{5}{\mathop{C}}\,{{H}_{2}}-\underset{\begin{smallmatrix} | \\ C{{H}_{2}}-C{{H}_{3}} \end{smallmatrix}}{\mathop{\overset{4}{\mathop{C}}\,H}}\,-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{\overset{3}{\mathop{C}}\,H}}\,-\overset{2}{\mathop{C}}\,{{H}_{2}}-\overset{1}{\mathop{C}}\,{{H}_{3}}\] Correct IUPAC name is 4-ethyl-3-methyl heptane because substituents are written in alphabetical order.
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