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Although carbocations are alwaysplanar but carbanions and free radicals can assume either planar or pyramidal geometry. Why is it so ? Explain.

Answer» <html><body><p></p>Solution :The simple alkyl carbanions are pyramidal. For example, <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PR_CHE_02_XI_C12_E16_016_S01.png" width="80%"/> <br/> However, carbanions in which the C-atom carrying the <a href="https://interviewquestions.tuteehub.com/tag/negative-570381" style="font-weight:bold;" target="_blank" title="Click to know more about NEGATIVE">NEGATIVE</a> charge is adjacent to a double bond or a benzene ring, are planar due to stabilization by <a href="https://interviewquestions.tuteehub.com/tag/resonance-1186596" style="font-weight:bold;" target="_blank" title="Click to know more about RESONANCE">RESONANCE</a>. Thus, allyl and benzyl carbanions are planar. <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PR_CHE_02_XI_C12_E16_016_S02.png" width="80%"/> <br/><img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PR_CHE_02_XI_C12_E16_016_S03.png" width="80%"/> <br/> Most of the free radicals are planar but free radicals in which the carbon atom carrying the <a href="https://interviewquestions.tuteehub.com/tag/odd-584820" style="font-weight:bold;" target="_blank" title="Click to know more about ODD">ODD</a> <a href="https://interviewquestions.tuteehub.com/tag/electron-968715" style="font-weight:bold;" target="_blank" title="Click to know more about ELECTRON">ELECTRON</a> is connected to a bridge head carbon or highly electronegative element are pyramidal. For examples. `CF_(3)` has pyramidal shape.</body></html>


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