Question

Allylides are ionic carbides. They contains:

• A. C4– ions
• B. C22– ions
• C. C33– ions
• D. C34– ions

Answer 1

Answer: (D)

C34– ions

Answer 2

Allylides gives 1-propyne on hydrolysis with water, e.g.,

Mg2C3 + 4H2O $\longrightarrow$2Mg (OH)2 + CH3– C $\equiv$ CH

Such compounds contain C34– $\left[ { } _ { 0 } ^ { \bullet } \mathrm { C } - \mathrm { C } \equiv \mathrm { C } _ { . } ^ { \bullet } \right] ^ { 4 - }$ ions.