Among the following, which pair is most likely to show a negative deviation?
(I) 
(II) , 
(III) 
(IV) 
Choose the most appropriate answer from the options given below:
Text Solution
Verified by ExpertsThe correct answer is:
B
Negative deviation occurs when 
attractions > A-A/B-B (e.g., H-bonding).
(I) 
: forms H -bond → negative deviation.
(IV) 
: H-bonding strengthens A-B interactions → negative deviation (by the same rule).
(II) 
: weaker 
interactions → positive deviation.
(II) 
: no strong specific interaction; 
not negative.
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