Which of the Following Molecules Are Constitutional Isomers A) I, II, IV
B) II, III, IV
C) I

Multiple Choice

Which of the following molecules are constitutional isomers? $$\begin{array} { c c c c } \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { OH } & \mathrm { CH } _ { 3 } \mathrm { CH } ( \mathrm { OH } ) \mathrm { CH } _ { 3 } & \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OCH } _ { 3 } & \mathrm { CH } _ { 3 } \mathrm { COCH } _ { 3 } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$$

A) I, II, IV
B) II, III, IV
C) I, III, IV
D) I, II, III