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Correct decreasing order of melting points in 13th group elements is

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By Expert Faculty of Sri Chaitanya
a
B > Al > Ga > In > Tl
b
B > Al > Tl > In > Ga
c
B > In > Al > Tl > Ga
d
Al > B > In > Tl > Ga

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detailed solution

Correct option is B

Boron - Giant Polymer - High m.pGallium - Discrete diatomic molecule - Low m.p ;B > Al > Tl > In > Ga.


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The bond dissociation energy of BF bond in BF3 is 646 kJ mol–1 whereas that of CF in CF4 is 315 kJ mol–1. The correct reason for higher B-F bond dissociation energy as compared to that of C-F bond is :

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