The hybrid orbitals involved are sp3 and sp2 hybrid orbitals.
Hybrid orbitals are orbitals obtained by combining atomic orbitals to give hybrid orbitals of appropriate energy that can take part in bond formation. The number of atomic orbitals combined is equal to the number of hybrid orbitals obtained after combination.
In C2H5NO having 4 C- H and one O - H bond, the hybrid orbitals involved are sp3 and sp2 hybrid orbitals. The sp3 hybrid orbitals occur in single bonds while the sp2 orbitals occur in double bonds. The structure of the molecule is shown in the image attached to this answer.
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