CHM231 Ch.9
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| What's the chemical formula for benzene? | C6H6
🗑
|
||||
| What are the bond angles in benzene? | All of them are 120 degrees
🗑
|
||||
| What are the carbon-carbon bond lengths in benzene? | 1.39 Angstroms
🗑
|
||||
| What is the hybridization of each carbon in benzene? | sp2
🗑
|
||||
| Can the structure of benzene be described correctly using Lewis structures? | No
🗑
|
||||
| What's resonance? | The concept in which two or more equivalent Lewis structures for the same arrangement of atoms (resonance structures) are necessary to describe the bonding
🗑
|
||||
| How does delocalization of pi electrons affect the total energy of a benzene molecule? | It lowers the total energy
🗑
|
||||
| What's resonance energy? | The difference in energy between a resonance hybrid with delocalized pi electrons and its most stable hypothetical contributing structures in which electrons are localized
🗑
|
||||
| What's one way to estimate the resonance energy of benzene? | Compare the heat of hydrogenation of benzene and cyclohexene
🗑
|
||||
| Is the resonance energy of 1,3 Butadeine smaller or larger than Benzene? | Smaller
🗑
|
||||
| What's the relation between number of resonance structures and stability of a molecule? | As # resonance structures increases, stability increases
🗑
|
||||
| What properties must a ring have to be considered aromatic? | Have 1 2p orbital on each atom of the ring, be planar or nearly planar, & have 4n+2 pi electrons in the cyclic arrangement of 2p orbitals
🗑
|
||||
| What's a heterocyclic compound? | A compound that contains one or more atoms other than carbon in its ring
🗑
|
||||
| What's a heterocyclic aromatic compound? | A heterocyclic compound whose ring is aromatic
🗑
|
||||
| What are two examples of heterocyclic aromatic compounds? | Pyridine (contains 1 N) & pyrimidine (contains 2 N's)
🗑
|
||||
| What is the hybridization of the Nitrogen atom in pyridine? | sp2
🗑
|
||||
| What are some examples of aromatic five-membered rings? | Furan, pyrrole, & imidazole
🗑
|
||||
| What's an electrophilic aromatic substitution? | A reaction in which an electrophile, E+, substitutes for an H on an aromatic ring
🗑
|
||||
| What's the steps for an electrophilic aromatic substitution? | A reagent generates an electrophile; Electrophile reacts with the ring; Finally a proton transfer occurs & regenerates the aromatic ring
🗑
|
||||
| How many transition states are there in electrophilic aromatic substitutions? | 2
🗑
|
||||
| What is needed for Chlorine & Bromine to react with benzene, and why? | A catalyst; It increases electrophilicity of the halogen
🗑
|
||||
| What's a benzene ring connected to an NO2 group called? | A nitrobenzene
🗑
|
||||
| What does Friedel-Crafts Alkylation do? | It forms a new C-C bond between an aromatic ring and an alkyl group
🗑
|
||||
| What's an acid chloride and what's another name for it? | Acyl chloride; It's a derivative of a carboxylic acid in which the -OH is replaced by a chlorine
🗑
|
||||
| What are the three locations on a benzene ring in relation to one X-group connected to the ring? | Ortho, meta, para
🗑
|
||||
| What is the name of a subsituent that causes the rate of a second substitutent to be greater than that of benzene itself? | Activating substituent
🗑
|
||||
| What is the name of a subsituent that causes the rate of a second substitutent to be lower than that of benzene itself? | Deactivating substituent
🗑
|
||||
| What are examples of ortho-para directing & activating groups? | Alkyl groups, phenyl groups, & amines
🗑
|
||||
| What are examples of ortho-para directing & deactivating groups? | Halogens
🗑
|
||||
| What are examples of meta-directing & deactivating groups? | Nitro groups, aldehyde groups, & esther groups
🗑
|
||||
| When the second substituent is in ortho or para positions compared to meta positions, is there a better or worse resonance stabilization of the carbocation intermediate? | Better
🗑
|
||||
| What's a phenol? | A 6-carbon ring that is connected to an -OH group
🗑
|
||||
| Are phenols or alcohols more acidic? | Phenols
🗑
|
||||
| Is benzene affected by strong oxidizing agents? | No
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
817229501
Popular Chemistry sets