Which species is most likely to act as a nucleophile in the conversion of CH₃CH₂Br to CH₃CH₂CN?
CN⁻ (cyanide ion) is a strong nucleophile that displaces Br⁻ in a substitution reaction to form CH₃CH₂CN (propanenitrile).
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism