(A) Bond energy depends on the size of the atoms involved in the bond. As the atomic size increases down the group,the bond length increases and the b

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(A) Bond energy depends on the size of the atoms involved in the bond. As the atomic size increases down the group,the bond length increases and the bond strength (bond energy) decreases. The order of atomic size is $C Si-Si > Ge-Ge > Sn-Sn$. Thus,the $C-C$ bond has the highest bond energy.