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

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B > Al > Ga > In > Tl

B > Al > Tl > In > Ga

B > In > Al > Tl > Ga

Al > B > In > Tl > Ga

answer is B.

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Detailed Solution

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

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