A) 2,3-dimethyl pentane
B) 3-chloro-2,3-dimethylpentane
C) 2,3,4-trimethylpentane
D) 3,3-dimethylpentane
Correct Answer: B
Solution :
3-chloro-2,3-dimethyl pentane contains all the four\[{{1}^{o}},{{2}^{o}},{{3}^{o}}\]and\[{{4}^{o}}\]carbon atoms. \[\underset{3-chloro-\text{ }2,3-\text{ }dimethyl\text{ }pentane}{\mathop{\underset{{{1}^{o}}}{\mathop{C{{H}_{3}}}}\,-\underset{{{3}^{o}}}{\overset{\begin{smallmatrix} {{1}^{o}} \\ C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{CH}}}\,-\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\overset{\begin{smallmatrix} {{1}^{o}} \\ C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{{{C}^{{{4}^{o}}}}}}}\,-\overset{{{2}^{o}}}{\mathop{C{{H}_{2}}}}\,-\overset{{{1}^{o}}}{\mathop{C{{H}_{3}}}}\,}}\,\]
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