The term carbide is generally applied to compounds in which carbon is bonded to the elements of ...
0The term carbide is generally applied to compounds in which carbon is bonded to the elements of lower or approximately same electronegativity. This definition excludes the compounds in which oxygen, sulphur, phosphorus, nitrogen, and halogens are united with carbon. Reactive metals (i.e., of groups 1 and 2) form ionic carbides. They hydrolyze to liberate hydrocarbons. Most of them resembles with \( \mathrm{NaCl} \) in crystal structure. Transition metals forms interstitial carbides.
Select the methanides from compounds given below:
\( \begin{array}{cccc}\mathrm{Al}_{4} \mathrm{C}_{3} & \mathrm{Be}_{2} \mathrm{C} & \mathrm{MgC}_{2} & \mathrm{BaC}_{2} \\ \text { I } & \text { II } & \text { III } & \text { IV } \\ \text { (a) I only } & & \text { (b) I and IV } \\ \text { (c) I and II } & & \text { (d) I, II, III, and IV }\end{array} \)
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