The compound which does not exist is

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(A) Sodium forms a stable superoxide $NaO_2$ when heated in excess of oxygen.$(NH_4)_2BeF_4$ is a known complex compound.$BeH_2$ is a polymeric hydrid

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$NaO_2$

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(A) Sodium forms a stable superoxide $NaO_2$ when heated in excess of oxygen.$(NH_4)_2BeF_4$ is a known complex compound.$BeH_2$ is a polymeric hydride.$PbEt_4$ (Tetraethyllead) is a well-known organometallic compound.However,the question as stated is technically flawed because all listed compounds exist. If we consider the stability of alkali metal superoxides,$NaO_2$ is stable,but $LiO_2$ is not. Given the options,there might be a typo in the question source. Assuming the question intended to ask for a non-existent compound,none of these fit perfectly,but $NaO_2$ is often discussed in the context of stability compared to other alkali superoxides.

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