Remember that in order to demonstrate a certain trend - you need to make sure th
ID: 528295 • Letter: R
Question
Remember that in order to demonstrate a certain trend - you need to make sure that there is mainly one factor that affects the properties of the compounds in the set that you choose. For example, for problem 1 below, you want to pick 3 molecules that are similar in size in order to rule out the possibility that other factors may also influence bp. Please consult your workshop instructor is you need help to begin. Pick three molecules from the table that help you to illustrate the following trend: The stranger the IMFs the higher the boiling point (a) Draw structures for these molecules (starting with the one that has the lowest bp and ending with the one that has the highest bp). List the types of IMFs that are present in each compound. bp(1)Explanation / Answer
Bp(1) will be teeth but um alcohol
Bp(2) will be 2- butanol
Bp(3) will be n- butanol
The reason for such observation is intermolecular force of attraction (IMF) as these three compounds have same molecular weight and all of them are alcohols. Hence two types of IMF is arising over here one is hydrogen bonding whose extent will be same for all another one will be vanderwall force of attraction which is the deciding factor here.
Vanderwall force of attraction is directly proportional to the surface area of molecule.so higher is the attraction higher will be the boiling point.
And we also know that with increase in branching surface area of the molecule decreases. Hence most branched structure will have least surface area and hence least force of attraction which in turn makes the boiling point least. That's why this order is observed.