Hydrogen cyanide bonding molecular orbitals

Formally, the lone pairs on molecular nitrogen, hydrogen cyanide, and carbon monoxide are sp hybrid orbitals, whereas NLMO hybridizations calculated even lower p contributions. Hence, these lone pairs have low directionality, the electron density remains close to the coordinating atom and interaction between the lone pair and the Be2+ is comparatively weak. The Be-L bonds are easily disrupted and ligand exchange consequently can proceed with a low activation barrier. A high degree of p character, on the other hand, means that the lone pair is directed toward beryllium, with electron density close to the metal center, and thus well suited for coordination. 

Problem 16.1 Hydrogen cyanide, HCN, is isoelectronic with the N2 molecule. The Lewis structure would presumably be H-C=N . Do you expect the molecule to he linear or bent Give a description of the bonding in terms of 2c molecular orbitals. 

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