The term removed refers to the number of generations separating the cousins themselves. So your first cousin once removed is the child (or parent) of your first cousin. Your second cousin once removed is the child (or parent) of your second cousin. And your first cousin twice removed is the grandchild (or grandparent) of your first cousin. Clearly, it doesn't take many generations before your family tree is a bit unwieldy.
A molecule can have more than one acyl halide functional group. For example, adipoyl dichloride, usually simply called adipoyl chloride, has two acyl chloride functional groups; see the structure at right.It is the dichloride (i.e., double chloride) of the 6-carbon dicarboxylic acid adipic acid.n acyl halide (also known as an acid halide) is a chemical compound derived from an oxoacid by replacing a hydroxyl group with a halide group. If the acid is a carboxylic acid, the compound contains a âCOX functional group, which consists of a carbonyl group singly bonded to a halogen atom.
Benzyl acetate has an ester functional group (in red), an acetyl moiety (circled with dark green) and a benzyloxy moiety (circled with light orange).Other divisions can be made. functional group is a moiety that participates in similar chemical reactions in most molecules that contain it. In turn the parts of the group are termed moieties. For example, methyl para-hydroxybenzoate contains a phenol functional group within the acyl moiety, which in turn is part of the paraben moiety.