question_answer3) Among the following four structures I to IV \[{{C}_{2}}{{H}_{5}}-\overset{\begin{smallmatrix} C{{H}_{3}} \\ || \end{smallmatrix}}{\mathop{C}}\,H-{{C}_{3}}{{H}_{7}}C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-\overset{\begin{smallmatrix} C{{H}_{3}} \\ || \end{smallmatrix}}{\mathop{C}}\,H-{{C}_{2}}{{H}_{5}}\] (I) (II) \[H-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{{{\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\mathop{C}}\,}^{\oplus }}}}\,\] \[{{C}_{2}}{{H}_{5}}-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}\,H-{{C}_{2}}{{H}_{5}}\] (III) (IV) it is true that
AIEEE Solved Paper-2003