The order of reactivity of amines with CH₃COCl is:
Reactivity decreases as substitution on nitrogen increases due to steric hindrance and lone pair availability: primary > secondary > tertiary, as per the PDF’s chemical properties.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Chemical Reactions - Alkylation, Acylation and Electrophilic Substitution