The strengths of bond formed by overlapping of atomic orbitals are in the order :
s-s > s-p > p-p
s-s < p-p < s-p
s-p < s-s < p-p
p-p < s-s < s-p
As we learn
Valence bond theory ( VBT ) -
Greater the extent of overlap, stronger is the bond formed.
s-Orbitals can have greater overlap and as a result, stronger bonds are formed when they are involved in bond formation
Hence, the correct option is (1)
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