why boron trihalide act as lewis acidwhy Boron trihalides act as Lewis acid
Answers
boron trihalides have only 6 electrons in the outermost orbit and hence an incomplete octet. Hence it can accept an electron pair for octet completion and thus it acts as Lewis acid.Lewis acids are those which can accept electron pair.
Boron trihalides act as lewis acid as they contain sextet of electrons
Explanation:
According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.
As boron trihalides are covalent compounds which contains 6 electron pairs and thus is short of two electrons to complete its octet, thus it can easily accept an electron pair and thus acts as an lewis acid.
As valency of boron is 3 and that of halogens is one .Thus one electron each from three halogen atoms share electrons with boron and form three single bonds.
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