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Q.

The C-C single bond length is 1.54 A° and that of Cl-Cl is 1.98 A°. If the electronegativity of Cl and C are 3.0 and 2.5 respectively, the C-Cl bond-length will be equal to __________ A°.

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answer is 1.71.

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Detailed Solution

It is provided in the question single bond lengths are:

C-C is  1.54 A°

Cl-Cl is 1.98 A°

And the electronegativity of Cl is 3.0 and that of C is 2.5.

The bond length of C-Cl can be calculated using the formula as shown below:

C-Cl=rC+rCl2-0.09XCl-XC

Substituting the values provided in the question and solving further we get:

C-Cl=1.54+1.982-0.093-2.5 C-Cl=3.522-0.090.5 C-Cl=3.522-0.045 C-Cl=1.76-0.45 C-Cl1.71


Hence, the required answer is 1.71.

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The C-C single bond length is 1.54 A° and that of Cl-Cl is 1.98 A°. If the electronegativity of Cl and C are 3.0 and 2.5 respectively, the C-Cl bond-length will be equal to __________ A°.