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a
CsF
b
HCl
c
HF
d
LiF
answer is B.
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Detailed Solution
The covalent compounds have low melting point due to weaker forces of attraction among them as compared to strong forces of attraction in ionic compounds.∵ HCl is covalent compound among CsF, HCl HF and Li(CsF, HF and LiF are ionic compounds)∴ HCl has minimum boiling point.