MCQ
$PbI_4$ does not exist because
- Aiodine is not a reactive
- ✓$Pb(IV)$ is oxidizing and $I^-$ is strong reducing agent
- C$Pb(IV)$ is less stable than $Pb(II)$
- D$Pb^{4+}$ is not easily formed
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$O(g) + e^- \to O^-(g); \Delta H = - 142 \,kJ \,mol^{-1}$
$O^-(g) + e \to O^{2-} (g); \Delta H = 844\, kJ \,mol^{-1}$
This is because

$[CH_3CH(CH_3)]_2 \,C(CH_2CH_3)C(CH_3) C(CH_2CH_3)_2$