A) \[\underset{\text{2, methyl-3-butanone}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}}}\,\]
B) \[\underset{\text{2, 3-dimethyl pentane}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{2}}-C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}}}\,\]
C) \[\underset{\text{4-methyl-2-pentyne}}{\mathop{C{{H}_{3}}-C\equiv CCH{{(C{{H}_{3}})}_{2}}}}\,\]
D) \[\underset{\text{2-bromo-3-chlorobutane}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{CH}}\,-\underset{\begin{smallmatrix} | \\ Br \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}}}\,\]
Correct Answer: A
Solution :
\[\overset{1}{\mathop{C{{H}_{3}}}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\overset{2}{\mathop{C}}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{3}{\mathop{CH}}}\,-\overset{4}{\mathop{C{{H}_{3}}}}\,\] Correct name is 3-methyl ?2-butanone.
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