- ✓$O\, \leftarrow \,O\,\, = \,\,O$
- B$ \leftarrow \,O\,\, = \,\,O \rightarrow $
- C$ > \,O \to \,O\, < $
- D$ - \,\,O\, - \,O\, - $
$H _2 O > H _2 S > H _2 Se > H _2 Te$
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$(1)$ trans $-[Co(NH_3)_4 Cl_2]^+$
$(2)$ cis $-[Co(NH_3)_2 (en)_2]^{3+}$
$(3)$ trans $-[Co(NH_3)_2(en)_2]^{3+}$
$(4)$ $NiCl^{2-}_4$
$(5)$ $TiF^{2-}_6$
$(6)\, CoF^{3-}_6$
Choose the correct code
$(1)$ $Y$ is diamagnetic in nature while $Z$ is paramagnetic
$(2)$ Both $Y$ and $Z$ are coloured and have tetrahedral shape
$(3)$ In both $Y$ and $Z , \pi$-bonding occurs between $p$-orbitals of oxygen and $d$-orbitals of manganese.
$(4)$ In aqueous acidic solution, $Y$ undergoes disproportionation reaction to give $Z$ and $MnO _2$.
The correct decreasing order of enthalpies of reaction for producing carbocation is
