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 atonic \[\underset{3-\text{chloro}-2,3-\text{dimethyl}\,\text{pentane}}{\mathop{\underset{{{1}^{o}}}{\mathop{C{{H}_{3}}}}\,-\overset{{{1}^{o}}}{\mathop{\overset{C{{H}_{3}}}{\mathop{\underset{{{3}^{o}}}{\overset{|}{\mathop{CH}}}\,}}\,}}\,-\overset{{{1}^{o}}}{\mathop{\underset{Cl}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{{{4}^{o}}}}}}}\,}}}\,-}}\,\overset{{{2}^{o}}}{\mathop{C{{H}_{2}}}}\,-\overset{{{1}^{o}}}{\mathop{C{{H}_{3}}}}\,}}\,\]
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