What is the number of electrons shared between the carbon atoms in an ethene molecule?

Regents Chemistry Exam June 2025 Question 23

23 What is the number of electrons shared between the carbon atoms in an ethene molecule?

(1) 6 (2) 2

(3) 3 (4) 4

Solution:

Table Q on the Reference Table lists all the series of hydrocarbons. An alkene, such as ethene, has a C=C. Every bond shares two electrons. Therefore, a double bond shares 4 electrons. Choice 4 is the correct answer.

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