Which of the following is methanide?

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${CaC}_{2}$

${Mg}_{2} C_{3}$

${Be}_{2} C$

${SrC}_{2}$

answer is A.

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Detailed Solution

Methanides are ionic carbides that contains discreate carbon atoms in the form of C^4- and given methane on hydrolysis.

Hydrolysis of Be₂C is:

${Be}_{2} C + 4 H_{2} O \to 2 Be {(OH)}_{2} + {CH}_{4}$

Hydrolysis of CaC₂ is:

${CaC}_{2} + 2 H_{2} O \to Ca {(OH)}_{2} + C_{2} H_{2}$

Hydrolysis of SrC₂ is:

${SrC}_{2} + 2 H_{2} O \to Sr {(OH)}_{2} + C_{2} H_{2}$

Hydrolysis of Mg₂C₃ is:

${Mg}_{2} C_{3} + 4 H_{2} O \to 2 Mg {(OH)}_{2} + HC \equiv C - {CH}_{3}$

Hence, Be₂C is a methanide.

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