Hypo acid means the main element have lower oxidation state than the present acid.Here, \\\\(HClO,{ HClO }_{ 2 }\\\\) are Hypo acid \\\\({ HClO }_{ 3 }\\\\) \\\\({ H }_{ 3 }{ PO }_{ 2 }\\\\) is hypo acid of \\\\({ H }_{ 3 }{ PO }_{ 3 }\\\\) \\\\(HNO\\\\) is hypo acid of \\\\({ HNO }_{ 2 }\\\\)But \\\\({ H }_{ 2 }{ SO }_{ 2 }\\\\) doesn't have hypo acidAns :- Option A.