A) 3-methyl-2-ethylpentane
B) 2-ethyl-3-methylpentane
C) 3-ethyl-2-methylpentane
D) 2-ethyl-2-methylpentane
Correct Answer: C
Solution :
While naming branched chain alkanes, if two alkyl groups are present on the parent chain, each alkyl group prefixed by its positional number is arranged in alphabetical order (irrespective of its positional number) before the name of the parent alkane. Thus, the correct \[IUPAC\] name is, \[\underset{3-ethyl-2-methylpentane}{\mathop{\overset{1}{\mathop{C}}\,{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{2}{\mathop{C}}}\,H-\overset{\begin{smallmatrix} C{{H}_{2}}C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{\underset{3}{\mathop{C}}\,}}\,H-\underset{4}{\mathop{C}}\,{{H}_{2}}-\underset{5}{\mathop{C}}\,{{H}_{3}}}}\,\]
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