Highest melting point would be of

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$CsCl$

${NH}_{3}$

${CHCl}_{3}$

answer is B.

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Detailed Solution

An ionic bond is formed when there is a transfer of electrons from a metal to a non-metal. Ionic compounds are very strong and have a high melting and boiling point because there is an electrostatic force of attraction between the atoms of the ionic compounds.
A covalent bond is formed when there is a sharing of electrons between the bonded atoms. The melting point and boiling point of covalent compounds are lower than those of ionic compounds because there is no electrostatic force of attraction between the covalent compounds.
Among the given options, CsCl is an ionic compound because there is an electron transfer from metal (Cs) to a non-metal (Cl). Therefore, CsCl has the highest melting point.

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