please explain what's the effect of the neighboring group on the rate of reaction by using chair form please brief all steps in Details

by using cyclohexan chairform explained the answer

Neighboring-Group Participation (when the When a molecule that can react by nucleophilic substitution also conta substituent group that can act as a nucleophile, it is often observed that the rat stereochemistry of the nucleophilic substitution are strongly affected. 11- Explain why reaction A is faster CH3CO2HCH3CO2 A k=1.9104s1(100C) CH3CO2HCH3CO2 B k=2.9107s1(100C)