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Which of the following carbides on treatment with water give methane ?
A. ` CaC_2`
B. `Be_2C_`
C. `Al_4C_3`
D. `Mg_2C_3`

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Correct Answer - B::C
`Be_2C +4H_2O rarr 2Be(OH)_2 underset("Methane") ( CH_4)`
`Al_4C_3 +12H_2O rarr 4A l(OH)_3 + underset ("Methance")`
`CaC_2+2H_2 O rarr Ca(OH)_2 + underset ("Acetaylenc")`
`Me_2gC_3 + 4H_2O rarr 2Mg(OH)_2 + underset ("Propne") (HC -= C-CH_3)`.

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