Write structural formula for :

3 ethyl- 2,3,- dimethylpentane

ALSO

How many single bonds are in a hexane molecule?

Hexane: there are five bonds C-C, 12 C-H

CH3-CH(CH3)-C(CH3,C2H5)-CH2-CH3

To write the structural formula for 3-ethyl-2,3-dimethylpentane, we need to break down the name and understand its components.

First, let's focus on the pentane part. Pentane is a hydrocarbon with five carbon atoms in a straight chain. Each carbon atom is bonded to two hydrogen atoms. The structural formula for pentane is:

CH3-CH2-CH2-CH2-CH3

Next, we need to add the substituents. The name specifies that there are two methyl groups (CH3) attached to the carbon atom at the second position (2,3-dimethyl) and one ethyl group (C2H5) attached to the carbon atom at the third position (3-ethyl). To correctly position the substituents, we replace the corresponding hydrogen atoms on the main pentane chain.

The structural formula for 3-ethyl-2,3-dimethylpentane would be:

CH3-CH2-CH(C2H5)-CH(CH3)-CH3

Moving on to the second part of the question, hexane is a hydrocarbon chain with six carbon atoms. Each carbon atom is bonded to two hydrogen atoms.

The structural formula for hexane is:

CH3-CH2-CH2-CH2-CH2-CH3

To count the number of single bonds in hexane, we need to count the total number of bonds between carbon atoms. In a hydrocarbon chain, each carbon atom forms four single bonds with neighboring carbon atoms (two on each side). Since hexane has six carbon atoms, there are six single bonds.

Therefore, there are six single bonds in a hexane molecule.