Question

The correct electron-dot formulation for hydrogen cyanide (HCN) shows:
(a) 2 double bonds and two lone pairs of electrons on the N atom.
(b) 1 C-H bond, 1 C=N bond, 1 lone pair of electrons on the C atom and 1 lone                
          Pair of electrons on the N atom.
(c) 1 C-H bond, 1 C-N bond, 2 lone pairs of electrons on the C atom and 3 lone   
          Pairs of electrons on the N atom.
(d) 1 triple bond between C and N, 1 N-H bond and 2 lone pairs of electrons on 
      The C atom.
(e) 1 triple bond between C and N, 1 C-H bond and 1 lone pair of electrons on 
      The N atom.
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Answer 1

(e) 1 triple bond between C and N, 1 C-H bond and 1 lone pair of electrons on 

      The N atom.

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