Which of the following option(s) is/are correct regarding carbides?

Methanides are type of ionic carbides

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Acetylides are type of covalent carbides

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Allylides on reaction with

H_{2} O

give

C_{3} H_{4}

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S i C

and

B_{4} C

are examples of covalent carbides.

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Solution

The correct option is D $S i C$ and $B_{4} C$ are examples of covalent carbides.
Carbides:
The binary compounds of carbon with other elements (less electronegative or of similar electronegativity) are called carbides.
Carbides can be classified into :

Ionic

Covalent

Interstitial (Metallic)

Ionic carbides: Generally formed by the most electropositive elements such as, alkali and alkaline earth metals and aluminium. Ionic carbides include :

Methanides

Acetylides

Allylides

Methanides:
Gives $C H_{4}$ on reaction with $H_{2} O$ .
Example:
$A l_{4} C_{3} + 12 H_{2} O \to 4 A l (O H)_{3} + 3 C H_{4}$
$B e_{2} C + 4 H_{2} O \to 2 B e (O H)_{2} + C H_{4}$

Acetylides:
Gives $C_{2} H_{2}$ on reaction with $H_{2} O$ .
Example:
$C a C_{2} + 2 H_{2} O \to C a (O H)_{2} + C_{2} H_{2}$

Allylides:
$M g_{2} C_{3} + 4 H_{2} O \to 2 M g (O H)_{2} + C_{3} H_{4}$
Covalent Carbides:
$S i C$ and $B_{4} C$ are examples of covalent carbides.

Interstitial or Metallic Carbides:
Formed by transition metals and some of the lanthanides and actinides.They retain many properties of metals like they conduct electricity and have metallic lusture. They are generally very hard and have very high melting point

Options (a) , (c) ,(d) are corrrect

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