# Why sp2 hyb. have more energy density compared with sp3?

why sp2 hyb. have more e. density comp with sp3 in nmr calculation stuff ?

Because in a sp2 hyb., the bond is stronger, so atoms are closer then in sp3 single bond.

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DrDu
why sp2 hyb. have more e. density comp with sp3 in nmr calculation stuff ?
Do you really mean energy density or rather electron density?

sp2 hybrids have more s character than sp3 hybrids. The chemical shifts depend on the electron density near the nucleus, but only s-orbitals have electron density at the nucleus, hence they are most effective in shielding.

TeethWhitener