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NDA 2017 GAT · General Knowledge · Carbon and Organic Chemistry · hard

The number of sigma and pi bonds in an ethyne (acetylene) molecule are respectively

Single correct option

The number of sigma and pi bonds in an ethyne (acetylene) molecule are respectively
  1. A. 2 and 3
  2. B. 3 and 2
  3. C. 5 and 1
  4. D. 4 and 1
Show answer and solution

Answer: (B) 3 and 2

Ethyne is H-C triple bond C-H. The triple bond has one sigma and two pi bonds, and each C-H bond is a sigma bond. Total sigma bonds are 1 + 2 = 3 and pi bonds are 2. Five sigma and one pi bond describe ethene, and the options are traps for this.
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Original question written in the NDA 2017 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake