LiAlH4 and NaBH4 both are reducing agent and use for reduction of polar multiple bond (>C=O ,-CN ). But LiAlH4 is stronger than NaBH4 because NaBH4 breaks into Na+ cation and BH4 - anion. Now, BH4 - ion breaks into BH3 stable ground state and protonates H - ion ie. Hydride ion and this hydride ion acts as a reducing agent. In BH4 - ion Boron is more electronegative atom as compared to aluminum in AIH4 - ion. Thus, reducing power of hydride ion gets lowered as boron withdraws more electrons towards itself as compared to Aluminlum, so the hydrides of aluminum are more reducing in nature than hydrides of baron.
Monday, February 10, 2020
What are the structure of cyclic trimer of SO3 , Methylcyclotrisilicone, Cyclotrimetaphosphate and cyclotrisilicate ion ?
Important fact: that cyclic trimer of Methyltrisilicone [(CH3)6SiO3] is isoelectronic with of timer of SO3 (S3O9),Si3O9-6,P3O9-3 and contains 120 electrons.
Related Questions:
What are structures of SO3 in gas phase as well as solid phase ( at room temperature)?
In
gas phase sulphur atom of SO3 has sp2 hybridized and
trigonal structure. In which three sigma bond give rise to trigonal planer
shape and
three delocalized π-bond, out of three π-bond one is pπ-pπ bond and another two are pπ-dπ bond.
In
solid phase SO3 exist at room temperature and have two different structures.
Important fact that
cyclic trimer of SO3 (S3O9)
is also isoelectronic with P3O9-3 and contains 120
electrons.
Structure of Si3O9-6
Structure of P3O9-3
Related Questions:
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