Explain why BeH_(2) molecuJe has a zero dipole moment although the Be

1.	Explain why BeH_(2) molecuJe has a zero dipole moment although the Be - H bonds are polar.
Answer» Solution :`BeH_(2)` MOLECULE is linear. In Be - H bond Be (1.6) and ii (2.1) ELECTRONEGATIVITY So, bonding `e^(-)` pair is away from Be & NEAR to H so bond is polar. Be : H and `Be^(+delta) - H^(-delta) & " Be" OVERSET(rarr)(_) ` H but `BeH_(2)` is linear. B-A-B type molecule. So both BO-H dipole arrange in opposite direction . So their vector ADDITION is zero. So `BeH_(2)` is non polar . `H larr " Be" larr H equiv [""^(-delta)H - overset(+2 delta)("Be") - H^(-delta)]^(0)` `BeH_(2)` is linear hence it is non polar.

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