Help! I'm so confused by chem?

Question

select the correct answer for each of the following rows.

Lowest Bp: propane or pentane or butane

Highest IMF: alkane or alchohol or ether

Highest Bp: 1amine or 2amine or 3 amine

Lowest IMF: diol or triol or alcohol

Least Reactive: alcohol or alkane or alkyne

thank you!!!

Answer 1

I won't answer the question, but I will help you see what you should be observing and let you figure out the answers

Boiling point is related to the molecular weight when you compare molecules that are similarly branched.  Lower MW has lower bp.

IMF include London forces, dipolar interactions, and H-bonding.  They generally get stronger in this order.  A molecule that can H-bond will typically have stronger IMF than one that has only London and dipolar interactions.

Stronger IMF gives higer bp as a general rule.  Which of the three types of amines can make the most H-bonds?

Which of the three can make the fewest H-bonds?

Reactions generally occur at functional groups.  Which has no functional group?

Answer 2

Open yur chemistry book and start reading the information should be there in plain print.  Do your own homework. The carbon bonding will explain most of it.

Answer 3

Tell me whay IMF stands for and I'll be happy to help you.

1)  In the alkane series BP increases as the chain length increases (higher MW), so propane is lowest..

2)  Alcohol H-bonds most, so has highest IMF.

3)  H-bonding proceeds primary>secondary>tertiary, so primary has highest BP, but this assumes that the amines' MWs are approx equal...if not the higher MW may offset the H-bonding effect.

4)  The more -OH on the molecule, the more H-bonding, so (mono -OH) alcohol has lowest IMF. You can note this in the series propanol-propylene glycol-glycerine...how do their evaporation rates compare?

5)  Alkane is the least reactive, having no reactive site on the molecule, whereas alcohol has a reactive -OH group and alkyne's triple bond is v reactive.

Hope this helps to get you on the right track, but there is no substitute for studying the text, as previous answerer noted...lol