Explain Hell-Vollhard-Zelinski reaction. Also illustrate its synthetic importance.

The Hell-Vollhard-Zelinski (HVZ) reaction is a method of introducing a halogen (typically bromine) at the α-position of a carboxylic acid. This reaction involves the acylation of a carboxylic acid with a halogen and a __________ __________ ___ __________ _____ ________ _________ ______.
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