Which one is not true about carbides?

A l_{4} C_{3}

is methanide and produces methane on hydrolysis

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M g_{2} C_{3}

is propylide and produces propane on hydrolysis

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C a C_{2}

and

N a_{2} C_{2}

are acetylides and they produce acetylene on hydrolysis

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B e_{2} C

gives methane on hydrolysis

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Solution

The correct option is B $M g_{2} C_{3}$ is propylide and produces propane on hydrolysis
$M g_{2} C_{3}$ is propylide and produces propyne on hydrolysis.
(a)
$A l_{4} C_{3} + 12 H_{2} O \to 4 A l (O H)_{3} + 3 C H_{4}$
(b)
$M g_{2} C_{3} + H_{2} O \to M g (O H)_{2} + C_{3} H_{4}$
(c)
$C a C_{2} + 2 H_{2} O \to C a (O H)_{2} + C_{2} H_{2}$
$N a_{2} C_{2} + 2 H_{2} O \to 2 N a (O H) + C_{2} H_{2}$
(d)
$B e_{2} C + H_{2} O \to B e (O H)_{2} + C H_{4}$

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