CHM 219 MODULE 7UPGRADED QUESTIONS AND ANSWERS 2025/2026

CHM 219 MODULE 7UPGRADED QUESTIONS AND ANSWERS 2025/2026 Define Heterocyle as it applies to organic molecules. - correct answers-Cyclic molecules in which one or mroe carbon atoms are replaced by heteratoms - elements other than carbon or hydrogen. What are two main sub-groups of heterocyclic compounds? - correct answers-Aliphatic and Aromatic Explain why pyridine is soluble in water. - correct answers-First - the ability of pyridine to accept Hydrogen bonding interactions from water molecules due to the lone pair of electrons in the nitrogen atom. In addition, the electronegative nitrogen creates a relatively strong dipole moment in the pyridine molecule, thus making pyridine a polar compound overall. Is pyridine more likely to act as an acid or base? Explain. - correct answers-Pyridine, like all amines, is a weak base. Amines use the lone pair on the nitrogen atom to accept protons and thus act as bases. Name the two main classes of reactions that the pyridine molecule will undergo - - correct answers-EAS - Electrophilic Aromatic Substitution NAS - Nucleophilic Aromatic Substitution Heterocyclic six-membered rings with two or more N atoms present as a part of the ring system are known as what type of heterocycles? - correct answers-Azines Why are pyrimidines the most biologically important members of the diazene family of molecules? - correct answers-Derivatives of pyrimidines are important bases in the nucleic acids DNA and RNA , namely cytosine, thymine and uracil.