How many electrons are shared between the carbon atoms in a molecule of ethyne?

Regents Chemistry Exam August 2024 Question 25

25 How many electrons are shared between the carbon atoms in a molecule of ethyne?

(1) 6 (3) 3

(2) 2 (4) 4

Solution:

Table Q on the Reference Table lists three different types of hydrocarbons: alkanes, alkenes and alkynes. Ethyne is given as ana example for the alkynes. We can see a triple bond between the two carbons in ethyne. Each bond has two electrons. A triple bond represeating a sharing of 6 electrons. Choice 1 is the correct answer.

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