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Q.

The table shown lists the bond dissociation energies (Ediss) for single covalent bonds formed between carbon and atoms of elements A, B, C and D. Which element is the smallest atom ?
 

 Bond between C and other atomEdiss (KJ mol-1)
A)C – A240
B)C – B328
C)C – C276
D)C – D485

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a

C

b

B

c

A

d

D

answer is B.

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Detailed Solution

detailed_solution_thumbnail

The element ′D′ has the smallest atoms because It corresponds to strongest C−D bond and maximum bond dissociation energy (485 kJ/mol).
Smaller is the bond length, stronger is the bond and higher is the bond dissociation energy.

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