Which of the following are methanides?

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(A) Methanides are carbides that react with water to produce methane $(CH_{4})$ gas.$Be_{2}C + 4 H_{2}O \rightarrow 2 Be(OH)_{2} + CH_{4}$$Al_{4}C_{3}

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(A) Methanides are carbides that react with water to produce methane $(CH_{4})$ gas.$Be_{2}C + 4 H_{2}O \rightarrow 2 Be(OH)_{2} + CH_{4}$$Al_{4}C_{3} + 12 H_{2}O \rightarrow 4 Al(OH)_{3} + 3 CH_{4}$$CaC_{2}$ is an acetylide,producing ethyne $(C_{2}H_{2})$.$Mg_{2}C_{3}$ is an allylide,producing propyne $(C_{3}H_{4})$.Therefore,$Be_{2}C$ and $Al_{4}C_{3}$ are methanides.

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