From the following given data, identify the least reactive element?

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$∆_{i} H_{1}$	$∆_{i} H_{2}$	$∆_{eg} H$
520	7300	$-$ 60

$∆_{i} H_{1}$	$∆_{i} H_{2}$	$∆_{eg} H$
738	1450	$-$ 40

$∆_{i} H_{1}$	$∆_{i} H_{2}$	$∆_{eg} H$
2372	5250	+ 48

$∆_{i} H_{1}$	$∆_{i} H_{2}$	$∆_{eg} H$
1008	1846	$-$ 295

answer is D.

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Detailed Solution

Correct option is 4 as it has the highest value of first and second ionization energy. Also, the positive election gain enthalpy also indicates that it is the least reactive metal.

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