different between acetylide vs ethynide

English

acetylide (plural acetylides)

(organic chemistry) Any organic compound derived from acetylene or a terminal acetylene by replacing a hydrogen atom with a metal.

ethynide (plural ethynides)

(chemistry) the monobasic anion [HC?C]^- (a form of carbide) formally derived by removing a hydrogen atom from ethyne; any salt containing this anion

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