Modifies a noun

• halide: This was proved in the reduction of a series of ketone, ester and alkyl halide functionalities.

• iodide: Much more research is required to unravel the ecological significance ( if any ) of the alkyl iodides.

• nitrate: The alkyl nitrates are a reservoir species for NO x ( =NO 2 + NO ).

• chain: If methyl benzene is reacted with chlorine in the presence of uv light, substitution takes place in the alkyl side chain.

• group: An alkyl group attached to the ring makes the ring more reactive than the original benzene.

• nitrite: Poppers are small bottles filled with liquid chemicals called alkyl nitrites.