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Q. IUPAC name of following compound will be $ C{{H}_{3}}-C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-\underset{\begin{smallmatrix} | \\ CHO \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}-C{{H}_{3}} $

Rajasthan PETRajasthan PET 2002

Solution:

$ \underset{2-ethyl-3-methyl\text{ }pentanal}{\mathop{\overset{5}{\mathop{C}}\,{{H}_{3}}-\overset{4}{\mathop{C}}\,{{H}_{2}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{\overset{3}{\mathop{C}}\,H}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{2}}-C{{H}_{3}} \end{smallmatrix}}{\mathop{\overset{2}{\mathop{C}}\,H-\overset{1}{\mathop{C}}\,HO}}\,}}\, $