Question

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

Bond between C and other atom	Ediss (kJ mol-1)
C - A	240
C-B	328
C-C	276
C-D	485

(a) C

(b) D

(c) A

(d) B

Answer 1

Correct option is (b) D

The C - D bond is strongest, so it will be shortest or D atom will be smallest.