Melting points are normally the highest for

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(C) The correct answer is $(C)$.Amides exhibit high melting and boiling points due to strong intermolecular hydrogen bonding.In primary amides $(R-CON

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Primary amides

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(C) The correct answer is $(C)$.Amides exhibit high melting and boiling points due to strong intermolecular hydrogen bonding.In primary amides $(R-CONH_2)$,there are two hydrogen atoms attached to the nitrogen atom,which allows for extensive intermolecular hydrogen bonding.In secondary amides $(R-CONHR)$,there is only one hydrogen atom available for hydrogen bonding.Tertiary amides $(R-CONR_2)$ lack hydrogen atoms attached to the nitrogen atom,preventing them from forming intermolecular hydrogen bonds with each other.Therefore,the order of melting/boiling points is: $	ext{Primary amides} > 	ext{Secondary amides} > 	ext{Tertiary amides} > 	ext{Amines}$.

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