MCQ
The $IUPAC$ name of the compound is


- A$1, 1-$dimethyl$-3-$hydroxy cyclohexane
- ✓$3, 3-$ dimethyl$-1-$cyclohexanol
- C$3, 3-$dimethyl$-1-$hydroxy cyclohexane
- D$1, 1-$dimethyl$-3-$cyclohexanol


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$(i)\,CO(g)+ H_2O(g) \rightleftharpoons CO_2(g)+H_2(g)\,;\,K_1$
$(ii)\,CH_4(g)+H_2O(g) \rightleftharpoons CO(g)+3H_2(g)\,;\,K_2$
$(iii)\,CH_4(g) + 2H_2O(g) \rightleftharpoons CO_2(g)+ 4H_2(g)\,;\,K_3$
$(i)\, H_3PO_4+H_2O \rightarrow H_3O^+ + H_2PO_4^-$
$(ii)\, H_2PO 4^- + H_2O \rightarrow HPO_4^{2-} + H_3O^+$
$(iii)\, H_2PO_4^-+ OH^- \rightarrow H_3PO_4 + O^{2-}$
In which of the above does $H_2PO_4^-$ act as an acid ?