The correct order as indicate in each option is - Vidyadip

MCQ

The correct order as indicate in each option is

✓
$CaF_2 > CaCl_2 > CaBr_2$ Melting point
B
$CH_3F > CH_3Cl > CH_3Br$ Dipole moment
C
$np_{\pi } - np\pi < ns-ns > ns-np$ Extent of overlapping
D
$H_2 > H_2^+ = H_2^-$ Stability

✓

Answer

Correct option: A.

$CaF_2 > CaCl_2 > CaBr_2$ Melting point

a
Cation is same in all case while anions are different.

According to Fajans rule, the larger the size of the anion, greater is the covalent character of the ionic bond.

As covalent character increases, melting point decreases, thus order of melting point is:

$CaF _2\,> \,CaCl _2\,>\, CaBr _2$

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