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Number of π bonds in HCN:

A1
B2 (in C≡N triple bond)
C3
D0
Answer & Solution
Correct answer: B. 2 (in C≡N triple bond)
**HCN:** H-C≡N. The C≡N triple bond is 1 σ + 2 π. The H-C is single (σ only). **So total π bonds = 2.**
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