Ashish Kotkar Of course, we appreciate your honesty and I'll let Melissa and the team know. 👍

Thank you for your feedback Ashish, we understand that everyone may have a preference for certain instructors and we do our best to offer a variety of helpful videos. Of course, Melissa is definitely working on adding more videos and we are glad you are happy with her teaching. 

We do plan on having downloads available, our team is currently working on adding pdfs to go with each lesson video. 

Hi Reine,

Recall a meso compound has chiral centers, this is why an alkene is not a meso compound because it can not have a chiral center since it doesn't have enough groups to do so. 

You're very welcome Suzy! 

Hey Briana,

Here's the answer to this question from our Subject Expert Samantha: 

Several of these above reactions have the possibility of forming E/Z mixtures.

Hydrohalogenation can form E/Z isomers if the reaction is carried out on an internal alkyne. This reaction on terminal alkynes will not form E/Z isomers because you'll end up with two hydrogens on the carbon that was the terminal one.

Hydrohalogenation with Peroxides will form E/Z isomers in any situation (both internal and terminal alkynes).

Halogenation of alkynes using only 1 equivalent of X2 reagent will result in a mixture of E/Z isomers.

All of these situations come about due to the possible ways that molecules can approach each other in the transition state of the various mechanisms.

At this time we do not but our team is working on adding this. We'll send out an email once they're available.

Hi Erika,

I'll link up more videos that explain each reaction and have very similar examples:

a) Grignard Reagent  (Timestamps 0:00-13:24)

b) Epoxidation (Timestamp 0:00-5:37)

c) SN2 Reaction , I recommend drawing out the structure to see what type of alkyl halide it is. There are several examples at 34:04)

d) Fischer Esterification (Timestamp 07:42) This combination of a carboxylic acid and alcohol with acid will form an ester. 

e) SN1 and SN2 Reactions of Alcohols (Timestamps 0:00-10:48)

Hi Erika,

I'll link up the videos I recommend that explain how to do each type of reaction needed:

First thing to notice is that we are opening up the ring of that epoxide in structure A to get to B, also we added an OH and 2 additional carbons. 

To open up the ring we need a strong nucleophile and the only option we have for that is in c. You'll find the reaction and mechanism explained in the below video:

Chemmunity Team

Overall Proton transfer is a fundamental process in chemistry where a hydrogen ion (proton, H+) is transferred from one molecule (the donor) to another (the acceptor).

Proton transfer can refer to either Protonation or Deprotonation. 

Protonation adds a proton while deprotonation removes a proton.