Question

Predict the following to be primary secondary or tertiary: Hexane if insoluble in water. 1-Hexene if insoluble in water but tests positive for a Br2 test. 1-bromobutane if insoluble in water but tests positive for a AgNO3. Ethanol and cyclohexane if they both tests postive for a Lucas test. and finally Ether if it tests negative for a Lucas test.

Answer 1

What do you mean with primary secondary or tertiary? Did you mean primary secondary or tertiary carbon?. If that's the case, here's my answer:

Hexane is like this: CH₃CH₂CH₂CH₂CH₂CH₃ is insoluble in water, which means that do not react with water. This is primary (CH2+)

1-hexene is like this CH₂=CHCH₂CH₂CH₂CH₃ it reacts with Br₂ test, which means that Bromine is added to this compound to generate the 1,2-dibromohexane, which would be secondary in the second carbon and primary in the first carbon.

1-bromobutane is insoluble in water because in order to react with it, it needs to form a primary carbocation (when Bromine leaves the molecule). Is positive with AgNO3 because this compound is used to identify the presences of halides in a molecule.

Ethanol is a primary alcohol (CH₃CH₂OH) it's positive to Lucas Test, because this is a test for alcohols. and cyclohexane is primary too, all it has is CH₂ cyclics.

Finally the Ether (CH₃-O-CH₃) is primary too.

Hope this helps