p-Block elementsHard

Question

Allylides are ionic carbides. They contains :

Options

A.C4- ions
B.C22- ions
C.C33- ions
D.C34- ions

Solution

Allylides gives 1-propyne on hydrolysis with water, e.g.,
   Mg2C3 + 4H2O → 2Mg (OH)2 + CH3 − C ≡ CH
Such compounds contain C34- [ - C ≡ C :]4- ions.

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