question_answer

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

A) all four are chiral compounds

B) only I and II are chiral compounds

C) only III is a chiral compound

D) only II and IV are chiral compounds