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Solution


Q.

Correct order of IP1 is
1 B>Al>Ga>In>Tl  
2 B>Tl>Ga>Al>In  
3 B>Ga>Al>Tl>In  
4 B>Al>Ga>Tl>In  

Ans.

(2)

B>Tl>Ga>Al>In

801 > 589 > 579 > 577 > 558 (kJ/mol)