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