The correct order as indicated in each option | vedclass

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(A) $1$. For $CaF_2, CaCl_2, CaBr_2$,the melting point decreases as the size of the anion increases due to increased covalent character (Fajan's rule)

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$CaF_2 > CaCl_2 > CaBr_2$ (Melting point)

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(A) $1$. For $CaF_2, CaCl_2, CaBr_2$,the melting point decreases as the size of the anion increases due to increased covalent character (Fajan's rule). Thus,$CaF_2 > CaCl_2 > CaBr_2$ is correct.$2$. For $CH_3F, CH_3Cl, CH_3Br$,the dipole moment order is $CH_3Cl > CH_3F > CH_3Br$ because the bond length increase in $C-Cl$ outweighs the electronegativity difference in $C-F$.$3$. The extent of overlapping follows the order $ns-ns > ns-np > np_{\pi}-np_{\pi}$.$4$. Stability is determined by bond order. $H_2$ (bond order $1$) $> H_2^+$ (bond order $0.5$) $= H_2^-$ (bond order $0.5$). Thus,$H_2 > H_2^+ = H_2^-$ is correct.Note: Both $A$ and $D$ are technically correct statements based on chemical principles.

The correct order as indicated in each option is

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