Question

Which of the following statements are correct for $HCN$ molecule?

• A. Two $N$-bonds are perpendicular to each other
• B. Lone pair lying in the orbital which is perpendicular to both $N$-bonds
• C. The dipole moment value is non zero
• D. The direction of dipole moment is from $N$ to $H$-atom

Answer 1

Answer: (A), (B), (C)

The correct options are
A Two $N$-bonds are perpendicular to each other
B Lone pair lying in the orbital which is perpendicular to both $N$-bonds
C The dipole moment value is non zero

The dipole moment is directed from less electronegative to more electronegative and its dipole moment is non-zero. Two $\pi$ - bonds in the molecule are perpendicular to each other and also lone pair in N.

Hence options $A,B$ & $C$ are correct.