Question

Draw a condensed and a skeletal structure for each of the following:

a. 3,4-diethyl-2-methylheptane

b. 2,2,5-trimethylhexane

Short answer

Condensed structures display atoms but few, if any, bonds.

Step-by-step solution

Define condensed structure

Condensed structures display atoms but few, if any, bonds.

Define skeletal structure

Skeletal structures display bonds but few, if any, atoms.

Consider a succession of centre atoms that are linked from left to right

In all the given questions, carbon is the central atom moving along the parent chain, which is the chain containing the greatest number of carbon atoms in succession.

Calculate the bonds expected per atom

We know as per the rules for Lewis structures:

1. Because carbon has 4 valence electrons, it will form 4 bonds
2. Oxygen has 2 lonepairsand 2 unpaired electrons, and so will form 2 bonds.
3. Hydrogen will form 1 bond, as it has 1 valence electron.
4. Nitrogen will form 3 bonds as it has zero formal charge.

Check whether the octet rule is obeyed or not

According to the octet rule, atoms gain or lose electrons in order to achieve an outer shell electron configuration that is closest to that of a noble gas. The skeletal structures are made keeping this rule in mind.

Create the chemical structures and the skeletal structures of the given compounds