question_answer

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

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