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Poor leaving group in nucleophilic substitutions reaction

Answer» <html><body><p>A leaving group is a nucleophile acting in reverse; it accepts a lone pair as the bond between it and its neighbor (usually carbon for our purposes) is broken.So what makes a good leaving group?The “happier” and more <a href="https://interviewquestions.tuteehub.com/tag/stable-1223548" style="font-weight:bold;" target="_blank" title="Click to know more about STABLE">STABLE</a> that lone pair is, the better a leaving group it will be. The most predictive rule for leaving group ability is….Good leaving groups are weak bases.Why?<a href="https://interviewquestions.tuteehub.com/tag/think-661001" style="font-weight:bold;" target="_blank" title="Click to know more about THINK">THINK</a> about the <a href="https://interviewquestions.tuteehub.com/tag/dissociation-15685" style="font-weight:bold;" target="_blank" title="Click to know more about DISSOCIATION">DISSOCIATION</a> of an acid <a href="https://interviewquestions.tuteehub.com/tag/h-1014193" style="font-weight:bold;" target="_blank" title="Click to know more about H">H</a>–A to give H+ and A– . The species A– is the <a href="https://interviewquestions.tuteehub.com/tag/conjugate-929330" style="font-weight:bold;" target="_blank" title="Click to know more about CONJUGATE">CONJUGATE</a> base of HA. It accepts a pair of electrons from the H-A bond. It’s a base acting in reverse.The more stable A- is, the greater the equilibrium constant will be that favors dissociation to give A- .</p></body></html>


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