Which of the following molecules contain the same functional groups? $$\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OH } \quad \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OCH } _ { 2 } \mathrm { CH } _ { 3 } \quad \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { OH } \quad \mathrm { CH } _ { 3 } \mathrm { CH } ( \mathrm { OH } ) \mathrm { CH } _ { 3 }$$
$$\mathrm { I }\quad\quad\quad\quad\quad\quad\mathrm { II }\quad\quad\quad\quad\quad\quad\mathrm { III }\quad\quad\quad\quad\quad\quad\mathrm { IV }$$

Question

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Molecules I, III, and IV all contain the hydroxyl group (-OH), which is characteristic of alcohols. Molecule II contains an ether group (-O-), which is different from the others.

Which of the Following Molecules Contain the Same Functional Groups