Colour by Design - Arenes
13 important questions on Colour by Design - Arenes
What does benzene look like? Is it saturated or unsaturated?
A colourless liquid - very unsaturated
What is the molecular formula of benzene? What can be said about its shape and bond angles?
C6H6
A flat hexagonal structure (planar)
120 degrees
Why is the old structure of benzene (with three double bonds) no longer seen as correct?
- benzene does not undergo electrophilic addition reactions
- x-ray diffraction measurements show that the c-c bond lengths are equal (greater length than a double bond but less than a single bond)
- Higher grades + faster learning
- Never study anything twice
- 100% sure, 100% understanding
For my 1st exam I got a C. Then, I started looking for ways to learn better and I came across Study Smart. Since then I have scored a A+, A, A- and another A. I highly recommend it to everyone who wants to hear it. I am so happy with it!!
I was struggling to finish all my first-year subjects for 3 years. Then I discovered Study Smart, which helped me to finish all of them within 3 months.
Because of StudySmart, things are going well in many ways. Before, I always had study stress and no time for anything. Now I feel calm and confident (because of the program). I used to score a B, now I usually score an A or A+.
Hey Chris, I really want to thank you very much for developing the platform, I usually got around C for my exams, now I scored an A+, an A and a A- !!
Since using Study Smart, my average has increased significantly. I even completed a statistics course with a A+ while I'm bad at statistics. I took on extra courses this year, because of Study Smart. Thanks so much!
Ever since I started studying with StudySmart I passed all my exams !!! No more re-sits!! At first, I was happy with a pass and now I only get good grades. Many thanks!
I aced all the courses I studied with Study Smart. For law, I first scored a D, and now an A! I’m 100% sure that I’ll pass all the courses I study with Study Smart.
I always thought I studied well. My grades were fine. I could never have imagined that applying these study skills would have such a huge and direct impact on my grades, my speed and the pleasure I have in learning.
For the first time, I finally feel totally confident about the way I learn. I have the perfect overview and make great progress in terms of speed and the grades I get. Thanks, Chris!
I immediately started to enjoy learning again, and my grades soared. All of a sudden, everything went better. I highly recommend Study Smart to all students..
Being able to create my materials online made the process of studying so much smoother and quicker. I no longer have to spend a huge amount of my time on creating my summaries.
At first, my notes were a mess. Now I use Study Smart to take my notes in a perfectly structured way. It helps me to save a lot of time and do other things I enjoy.
Students that study with Study Smart get better grades. The system applies all the learning methods in such a way that both well-performing students and students who struggle perform much better.
Hi Chris, I would like to thank you very much. Last year I scored C on a course, and this year I got an A+ thanks to your method! Thank you very much!
The largest effect is that my child is more enthusiastic about school! Every parent wants their children to be happy at school, Study Smart made it happen.
In high school, I failed several exams, and that has really changed now. I actually needed this tool very much back then. Since I started studying with StudySmart, I haven't had any D's. My average score is now an A and those are results I would have never had in the past
With my old method, I passed only 3 out of 8 courses. Since I started taking my notes digitally in Study Smart, I have passed all my courses on the first try. For me, StudySmart takes away the stress of wondering if I will pass or not.
Thanks to StudySmart, I passed all my exams, and with better grades than before! On top of that, I have mastered a very good study method now, which I am confident will help me earn my degree.
What makes benzene so stable?
The cyclic delocalisation of electrons - electrons repel each other, so a system in which they are delocalised and as far apart from one another as possible will involve minimum repulsion = stabilised
(this arrangement is much more stable than an alternate single/double bond arrangement)
What does the stability of the benzene ring mean in the type of reactions it undergoes?
It tends to undergo reactions in which the stable ring is preserved - reactions which disrupt the delocalisied electron system are less favourable and need higher temps and more vigorous conditions = it undergoes substitution reactions
What chemical test could be used to distinguish between 1,3,5-trimethylbenzene and phenylethene?
Does benzene decolourise bromine solution?
nooooooo
What is a phenyl group? What is the molecular formula of phenyl?
A benzene ring in which one hydrogen atom has been substituted by another group.
C6H5
How many electrons are delocalisied in (a) benzene and (b) naphthalene?
(a) 6
(b) 10
Why can't a molecule containing arene rings not easily be hydrogenated?
All the double bonds are present in the arene rings and so will not be able to react easily. (pp june 2010 Q5(c))
Name two types of commercially important material whose manufacture involves the nitration of benzene.
- Dyes
- Explosives
How does a halogen carrier (e.g. AlCl3) allow the reaction between benzene and chlorine to take place?
It can form a dipole with the chlorine gas to form Cl+
Compare the different reactivities of benzene and alkenes towards chlorine.
In benzene the electrons are delocalised/ spread out. In alkenes electrons are concentrated between two carbons - electrophiles are attracted more to greater electron density in alkenes.
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
