Question

Lewis Diagram Representation of Bonding in an Organic Molecule The following organic compound, or a derivative thereof, is important in certain metabolic processes. OH C= 0 HO—C—CH,-¢-CH2-C-OH OH citric acid Complete the Lewis diagram before answering the following questions. How many pi bonds are there in a molecule of citric acid? 3 How many sigma bonds are there in a molecule of citric acid? 20 How many non-bonding valence electrons are there in a molecule of citric acid? 34 1pts Submit Answer Incorrect. Tries 4/5 Previous Tries

Answer 1

The given structure of citric acid is :o: H H :0: н-б-с-с-с-с-с-он H I-o-0-o-0I I-6-1:0: Important points to note to complete the Lewis structure is that the valence electrons around each atom should be accounted for. For example, Each O atom forms two bonds. Since O atom has 6 valence electrons, an O atom forming two bonds will have two lone pairs of electrons. Each C atoms forms 4 bonds and will have no lone pairs. Each H atoms forms 1 bond and will have no lone pairs. Also note that each double bond contains 1 sigma bond and 1 pi bond. Now, we can answer the questions as follows using the completed Lewis structure above. *Number of pi bonds = 3 (one each coming from 3 double bonds). *Total number of sigma bonds = 20 (four C-H bonds, seven C-O bonds, five C-C bonds, four O-H bonds) *Number of non-bonding valence electrons = 28 (seven O atoms each containing 4 valence non- bonding electrons)