a) How many pairs of non-bonding electrons are there in the molecule? b) How man

Question

a) How many pairs of non-bonding electrons are there in the molecule?

b) How many CH3 (methyl) groups are there in the molecule??

c) How many CH2 (methylene) groups are there in the molecule? (i.e. # of C-atoms having exactly two bonded H-atoms)

d) How many CH (methyne) groups are there in the molecule? (i.e. # of C-atoms having exactly one bonded H-atom)

e) How many ?-bonds are there in the molecule?

Stick Notation for Organic Molecular Structures The molecular structure of 3,5-dimethoxytoluene is represented below. In such shorthand diagrams, the end of each line segment, if not labelled with a chemical symbol, corresponds to a carbon atom. Hydrogen atoms bonded to carbon are frequently not drawn but are always inferred to complete the valence shell for each C atom. Non-bonding electrons for N and O atoms are also omitted from the diagram but can be inferred to complete those valence shells. Sometimes, for convenience, a structure is drawn in which one bond is shown as passing behind another from the point of view of the observer. In that case the bond is drawn broken to indicate that there is no intersection. Draw a complete Lewis structure of the molecule and answer the following questions. Complete the structure by adding ONLY hydrogen atoms to carbon atoms where needed. You must not create any other bonds. Atoms such as oxygen or nitrogen may have lone pairs to complete their octets. 7 6 10 9 4 8 2 Each of the non-hydrogen atoms of this skeletal structure has been randomly numbered Match the atom number with the orbital hybridization invoked for sigma bonding.

Explanation / Answer

a) 4 pairs (each O-atoms contains 2 pairs)

b) 3 groups

c) 0 groups

d) 3 groups

e) 23 sigma bonds

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