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Grignard Reagents

BeH2 is prepa...

Question

$B e H_{2}$ is prepared by the reaction of:

2 B e C l_{2} + L i A l H_{4} e t h e r \to 2 B e H_{2} + A l C l_{3} + L i C l

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B e + H_{2} \to B e H_{2}

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Both

(A)

and

(B)

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None of these

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Solution

The correct option is D $2 B e C l_{2} + L i A l H_{4} e t h e r \to 2 B e H_{2} + A l C l_{3} + L i C l$
Reaction for preparation of $B e H_{2}$
$2 B e C l_{2} + L i A l H_{4} e t h e r \to 2 B e H_{2} + A l C l_{3} + L i C l$
It is difficult to prepare $B e H_{2}$ by direct reaction of $B e$ and hydrogen gas.
All other alkali metal hydrides can be prepare accept Be:
$M + H_{2} \to M H_{2}$

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