નીચેના પૈકી કઇ જોડમાં $B$ કરતા $A$ વધુ સ્થાયી છે ?
$A$ || $B$
JEE MAIN 2014, Diffcult
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d $P{{h}_{3}}\overset{\centerdot }{\mathop{C}}\,$ is more stable than ${{\left( C{{H}_{3}} \right)}_{3}}\overset{\,\,\centerdot }{\mathop{C}}\,$ because resonance stabilisation effect in $P{{h}_{3}}\overset{\centerdot }{\mathop{C}}\,$ is more pronounced as compared to hyperconjugation stabilisation effect in ${{\left( C{{H}_{3}} \right)}_{3}}\overset{\,\,\centerdot }{\mathop{C}}\,$ overall stability order among free radical is : Triphenylmethyl $>$ benzyl $ >$ allyl $>$ tertiary alkyl $>$ secondary $>$ primary $>$ methyl $>$ vinyl
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