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NDA 2023 GAT · General Knowledge · Carbon and Organic Chemistry · hard

The number of sigma (σ) bonds in a molecule of ethene (C2H4) is

Single correct option

The number of sigma (σ) bonds in a molecule of ethene (C2H4) is
  1. A. 6
  2. B. 5
  3. C. 4
  4. D. 3
Show answer and solution

Answer: (B) 5

Ethene has four C–H single bonds, each a sigma bond, and one C=C double bond made of one sigma and one pi bond. Total sigma bonds = 4 + 1 = 5. Six is the mistake of counting both bonds of the double bond as sigma.
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Original question written in the NDA 2023 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