Amines (Part-1)

What is the definition of amines? How many marks carried by the chapter Amines in class 12 board examinations? Why we study the chapter Amines? How important the chapter Amines? What is the basis for the classification of Amines?

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Like ammonia, nitrogen atom of amines is trivalent and carries an unshared pair of electrons. Nitrogen orbitals in amines are therefore, sp3 hybridised and the geometry of amines is pyramidal. Each of the three sp3 hybridised orbitals of nitrogen overlap with orbitals of hydrogen or carbon depending upon the composition of the amines. The fourth orbital of nitrogen in all amines contains an unshared pair of electrons. Amines are organic compounds which are basic in nature and contain nitrogen atom as central one. The general form of an amine is shown in Lewis form. R represents an alkyl group, but either or both of the hydrogens may be replaced by other groups and still retain its class as an amine.