Single bond and sp?

I dont understand .single bond is stonger than pie. I know but the thing is , that in sp hybridization of ethyne,  the overlapping of sp is maximum than others ie. Sp3 and sp2 ...and it is a stronger bond. Then how can we say that single bond is more stronger than double or triple?

Is something wrong? 

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  • 4 weeks ago

    Covalent bonds can be classified as single bonds, double bonds, or triple bonds. All of them are made of σ bonds and π bonds.

    To form covalent bonds, there are two types of overlapping of orbitals, namely σ bonds and π bonds. As shown in the table below, σ bond is formed by normal overlapping of two orbitals, while π bond is formed by side-overlapping of two p orbitals. Obviously, normal overlapping must be more effective than side overlapping. Hence, for the same bonding atoms, σ bond is usually stronger than π bond.

    A single bond consists of one σ bond.

    A double bond consists of one σ bond and one π bond. As it has one more π bond than a single bond, an X=X double bond is stronger than an X-X single bond. In the X=X double bond, the σ bond is usually stronger than the π bond.

    A triple bond consists of one σ bond and two π bonds. As it has one more π bond than a double bond, an X≡X triple bond is stronger than an X=X double bond. In the X≡X triple bond, the σ bond is usually stronger than each of the two π bonds.

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