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Acyl halide
Any chemical compound having a halogen atom bonded to an acyl group
An acyl halide (also known as an acid halide) is a chemical compound derived from an oxoacid by replacing a hydroxyl group (−OH) with a halide group (−X, where X is a halogen). In organic chemistry, the term typically refers to acyl halides of carboxylic acids (−C(=O)OH), which contain a −C(=O)X functional group consisting of a carbonyl group (C=O) singly bonded to a halogen atom.
From Wikipedia
An acyl halide (also known as an acid halide) is a chemical compound derived from an oxoacid by replacing a hydroxyl group (−OH) with a halide group (−X, where X is a halogen). In organic chemistry, the term typically refers to acyl halides of carboxylic acids (−C(=O)OH), which contain a −C(=O)X functional group consisting of a carbonyl group (C=O) singly bonded to a halogen atom. The general formula for such an acyl halide can be written RCOX, where R may be, for example, an alkyl group, CO is the carbonyl group, and X represents the halide, such as chloride. Acyl chlorides are the most commonly encountered acyl halides, but acetyl iodide is the one produced (transiently) on the largest scale. Billions of kilograms are generated annually in the production of acetic acid.
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Hydrogen halide
Diatomic inorganic compound with the formula HX where X is one of the halogens: fluorine, chlorine, bromine, iodine, or astatine
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Halide
Binary compound, of which one part is a halogen atom and the other part is an element or radical that is less electronegative
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Carboxylic acid
Oxoacid having the structure RC(=O)OH, used as a suffix in systematic name formation to denote the –C(=O)OH group including its carbon atom
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carboxylic acid halide
Any chemical compound having a halogen atom bonded to a carboacyl group
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Dicarboxylic acid
Organic compound containing two carboxyl functional groups (−COOH)
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Amide
Any derivative of an oxoacid in which a (possibly substituted) amino group replaces an acidic hydroxy group