Question

Orgaaaaanic heaven full of questions :3 please helppp

Answer 1

@Kainui help plz >_<

Answer 2

So wait, are the red ones the right answers or your guesses?

Answer 3

No the red ones are the correct answers

Answer 4

So why do you think they're right, and what answers did you guys give? Also, did you figure out all those other ones from earlier and get helped?

Answer 5

No here's the thing, we solve on our own and then check the answer from the official marking scheme. If our answer is not matching with the marking scheme (hence incorrect answers) we try to figure out the reasoning as to why is it wrong and why it should be the other answer and if we can't figure out the reasoning we ask it here in Openstudy

Answer 6

Yeah, I know that's why I enjoy helping you guys. But this time you didn't tell me why. I just like to hear your wrong reasoning so that I can help correct your reasoning so you understand it better.

Answer 7

Well for question number 27..
If dehydration occur with one of the alcohols why is it that it will give three alkenes?

Answer 8

if there is 1 OH group, then should form 1 double bond only right?

Answer 9

im baaaack

Answer 10

Well, draw out all the alkenes that you think would form, and you'll see.

Answer 11

Well no need to torture you, actually all you're forgetting is really just the cis and trans isomers count as 2 different alkenes.

Answer 12

eh ohhh and i was thinking what is the third one

Answer 13

Alright, so next up, how about 26? Rank all of the bromoalkanes from primary, secondary, etc... and remember the difference between SN1 and SN2?

Answer 14

oh 1 question before u proceed , if one side of the double bond has CH2 and the other side is a pretty big R group and H does cis and trans happen?

Answer 15

Yes! I have the same question to ask too

Answer 16

Depends on if it causes too much stearic hinderance or not. Most of the time, trans is the most stable alkene and you'll see more of it, does that answer your question?

Answer 17

here is for q 27

Answer 18

in q 26 A is gonna be primary alcohol, B- secondary, C- primary and D- tertiary

Answer 19

Oh, I think I see what you mean. There's not trans/cis to happen there because it looks like this:

Answer 20

So if I draw in the hydrogens, there isn't any difference if you flip them around since they're identical on that CH2 group double bonded.

Answer 21

Exactly. Do you remember what reacts by SN1 and SN2 of those, primary, secondary, and tertiary?

Answer 22

hmm i remember that SN1 works with tertiary, SN2 with primary and both SN1 and SN2 take part in secondary

Answer 23

Rarely does a secondary react by SN1, it's usually SN2 like a primary. SN1 is really most commonly found for tertiary only.

Answer 24

yes i do remember that

Answer 25

SN1 has to rely on this to happen: Since carbon is a pretty good electron donating group, the positive charge left behind on a tertiary carbocation is fairly stable as an intermediate. A secondary will not be able to be very stable since it has a fairly positive hydrogen left behind near that positive charge leaving it to be fairly unstable.