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