Multiple choice

Which of the following is a quaternary ammonium salt ?

  1. Tetra-n-butylammonium fluoride

  2. Tetrabutylammonium tribromide

  3. Tetrakis(triphenylphosphine)palladium(0)

  4. Tetramethylazodicarboxamide
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A Correct answer
Explanation

Tetra-n-butylammonium fluoride or TBAF is a quaternary ammonium salt .It is usually encountered in the latter form as a source of organic-soluble fluoride ion to remove silyl ether protecting groups. It is also used as a phase transfer catalyst and as a mild base.

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