Q. The number of types of bonds between two carbon atoms in calcium carbide is:

 

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 145

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Chemical Bonding and Molecular Structure

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A

One sigma, one pi

B

Two sigma, one pi

C

Two sigma, two pi

D

One sigma, two pi

Solution:

Calcium carbide exists as

C

a

2

+

and

C

2

2

&#;

&#;

According to the molecular orbital model,

C

2

2

&#;

&#;

should have a bond order of 3 (configuration

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π

u

2

&#;

π

u

2

&#;

σ

g

2

&#;

). MOT configuration suggests that it contains one

σ

and two

π

-bonds

Chapter 8, Problem 105

Calcium carbide, CaC2, reacts with water to produce acetylene, C2H2, and is sometimes used as a convenient source of that substance. Use the MO energy diagram in Figure 8.22a to describe the bonding in the carbide anion, C22-. What is its bond order?

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