The correct electron-dot formulation for hydrogen cyanide shows:

2 double bonds and two lone pairs of electrons on the N atom.

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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.

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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.

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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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Solution

The correct option is D 1 triple bond between C and N, 1 C-H bond and 1 lone pair of electrons on the N atom.
Structure of Hydrogen cyanide is given as:

Hence, in the structure of HCN, there is a triple bond between C and N and 1 C-H bond and 1 lone pair of electron on N atom.

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