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Sodium borohydride (NaBH4) is synthesized by the reaction between which types of hydrides?

1. Two electron-deficient hydrides
2. Two saline (ionic) hydrides
3. One saline hydride and one electron-deficient hydride
4. One metallic hydride and one electron-deficient hydride

Correct answer: One saline hydride and one electron-deficient hydride

Solution

NaBH4 is synthesized by reacting NaH (a saline/ionic hydride, formed by alkali metals with H2) with B2H6/diborane (an electron-deficient hydride, as boron has only 3 bonds and forms 3-center-2-electron bonds). One saline + one electron-deficient hydride.

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