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Stability with respect to what? Any halogen taken by itself is perfectly stable so you must define a reaction or interaction to compare the different elements. Your question has nothing to do with the chemistry of the halogens. You went wrong in not reading your sources with care and not thinking through the chemistry.

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In case of ${CCl_3}^-$, the lone pair electrons are present in 2p orbital of C-atom while 3d-orbital of Cl atom is vacant. Hence, p$\pi-d\pi$ back bonding is present in the compound. The lateral overlap between the filled p-orbital of C and unfilled d-orbital of Cl gives rise to three equivalent resonating structures with $-ve$ charge lying over more ...

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Radical inhibitors like dihydroquinone ($\ce{H_2Q}$) are quenchers which inhibit the radical reaction by quenching an active radical ($\ce{R^.}$) to $\ce{R-H}$ and itself gets converted into a resonance stabilized non-reactive monohydoquinone ($\ce{HQ^.}$) radical species. Once the $\ce{R^.}$ gets converted to $\ce{R-H}$ the reaction stops as the formed ...

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