Which of the following alkaline earth metal will not form hydride on reactive with $H_{2}$ ?

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Solution

The correct option is A Be
All alkaline earth metals form hydrides on reacting with $H_{2}$ except Be. This is due to the less electropositive character of Be. On going down the group the electropositive character increase hence other alkaline earth metals forms hydride with $H_{2}$ .
$M + H_{2} \to M H_{2}$
where, M = Mg, Ca, Sr, Ba

Theory
Reactivity towards hydrogen:
All group 2 elements except Be combine with $H_{2}$ upon heating to form their corresponding hydrides, $M H_{2}$

$M + H_{2} ⟶ M H_{2}$
$B e H_{2}$ can be prepared by the reaction of $B e C l_{2} w i t h L i A l H_{4}$ .
$2 B e C l_{2} + L i A l H_{4} ⟶ 2 B e H_{2} + L i C l + A l C l_{3}$
Alkaline earth metals readily react with acids liberating dihydrogen.
$M + 2 H C l ⟶ M C l_{2} + H_{2}$

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