Class 11 NEET Chemistry Organic Chemistry Some Basic Principles And Techniques Part 1

Tertiary halide shows SN1 mechanism i.e., ionic mechanism. In the given reaction negative ion will attack on carbocation. Thus greater the tendency of ionisation (greater ionic character in M— F bond) more favourable will be reaction. The most ionic bond is Rb—F in the given examples thus most favourable reaction will be with Rb—F