Using IUPAC nomenclature, give the name of BH3 and AlH3 and elaborate why that name is correct

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24-03-2017
Physics

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Using IUPAC nomenclature, give the name of BH3 and AlH3 and elaborate why that name is correct

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RomeliaThurston RomeliaThurston · Answer 1 · 2019-02-28T02:24:33-05:00

Answer: The IUPAC name for \(BH_3\) is boron trihydride and that of \(AlH_3\) is aluminium hydride.

Explanation:

\(BH_3\) is a covalent compound as it is a compound formed between two non-metals. In this compound, boron and hydrogen shares electrons to form a bond.

The IUPAC nomenclature of covalent compound is given by some rules, which are:

The less electronegative element is written first. in the naming.
The more electronegative element is written then with a suffix at the end of it. The suffix used is '-ide'.
If the number atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on..

So, the name for \(BH_3\) compound is boron trihydride.

\(AlH_3\) is an ionic compound because aluminium element is a metal and hydrogen element is a non-metal and bond formed between a metal and a non-metal is always ionic bond.

The IUPAC nomenclature of ionic compounds is given by some rules, which are:

Positive ion (Cation) is written first. in the naming.
The negative ion (anion) is written next with a suffix at the end of the negative ion. The suffix written is '-ide'.

Hence, the IUPAC name of \(AlH_3\) is aluminium hydride.