Each pair forms an ideal solution except:

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(D) An ideal solution is formed by components that have similar molecular structures and polarities,resulting in similar intermolecular forces of attr

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$C_2H_5I$ and $C_2H_5OH$

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(D) An ideal solution is formed by components that have similar molecular structures and polarities,resulting in similar intermolecular forces of attraction. $C_2H_5Br$ and $C_2H_5I$,$C_6H_5Cl$ and $C_6H_5Br$,and $C_6H_6$ and $C_6H_5CH_3$ are pairs of compounds with similar structures and polarities,thus forming ideal solutions. However,$C_2H_5I$ and $C_2H_5OH$ do not form an ideal solution because $C_2H_5OH$ (ethanol) exhibits strong hydrogen bonding,while $C_2H_5I$ (iodoethane) does not. This difference in intermolecular forces leads to significant deviations from Raoult's law.

Molecule type	$\frac{C_P}{C_V}$
$A$. Monoatomic	$I$. $\frac{7}{5}$
$B$. Diatomic rigid molecules	$II$. $\frac{9}{7}$
$C$. Diatomic non-rigid molecules	$III$. $\frac{4}{3}$
$D$. Triatomic rigid molecules	$IV$. $\frac{5}{3}$

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