Noté sur 1,00 Consider the following: Which two structures represent the same compound? i) I and II if) II and III iii) I and III iv) II and IV v) None of these Réponse i. ii. iv iii. iii iv. V V. ii

To determine which two structures represent the same compound, we need to compare the molecular formulas of each structure.<br /><br />Let's analyze each structure:<br /><br />i) $I$ and $II$: The molecular formulas for $I$ and $II$ are both $C_2H_6O$. Therefore, these two structures represent the same compound.<br /><br />ii) $II$ and $III$: The molecular formulas for $II$ and $III$ are $C_2H_6O$ and $C_3H_8O$, respectively. These two structures do not represent the same compound.<br /><br />iii) $I$ and $III$: The molecular formulas for $I$ and $III$ are $C_2H_6O$ and $C_3H_8O$, respectively. These two structures do not represent the same compound.<br /><br />iv) $II$ and $IV$: The molecular formulas for $II$ and $IV$ are $C_2H_6O$ and $C_2H_5OH$, respectively. These two structures do not represent the same compound.<br /><br />v) None of these: This option is incorrect as we have already identified that $I$ and $II$ represent the same compound.<br /><br />Therefore, the correct answer is:<br />i) $I$ and $II$