In the following, which substance will have highest boiling point

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$CsF$

${NH}_{3}$

${CHCl}_{3}$

answer is B.

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Detailed Solution

Ionic compounds are formed when there is a transfer of electrons between the bonded atoms. These compounds have high melting and boiling points because there is an electrostatic force of attraction between the bonded atoms.
Covalent compounds form when there is sharing of electrons between the bonded atoms. These compounds have low melting and boiling points than ionic compounds because there is no electrostatic force of attraction between the bonded atoms.
He is inert, thereby forming neither ionic compounds nor covalent compounds.
CsF is an ionic compound as there is an electron transfer from Cs (metal) to F (non-metal).
NH₃ is a covalent compound as it forms when there is sharing of electrons between N and H atoms.
CHCl₃ is also a covalent compound because each bond present in CHCl₃ is formed by the sharing of electrons between the bonded atoms.

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