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Some help for extra creit.
Some help for extra creit.
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Topic: Some help for extra creit. (Read 1115 times)
ineedchemhelp
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Posts: 24
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Some help for extra creit.
«
on:
June 26, 2008, 05:12:33 PM »
hey guys,
I have a good idea of what the answers, I just want to double check with others.
1. which of the following are not good leaving groups?
- C2H5O-
- Cl- ( i found that this is an ok LG)
- I-
( a very good leaving group)
- CH3CO2-
( This is also an ok leaving group)
- All of the above
. I tried finding out information about the 1st option, but I am stuck. It is either down to option of or option 5.
2. Which nucleophilic subs. reaction would be unlikely to occur?
- HO- + CH3CH2-I------> CH3CH2-OH+I
- I- + CH3CH2-H----> CH3CH2-I + H-
- CH3S- + CH3-Br---------> CH3S-CH3 + Br-
- all of the above would be unilkely to occur.
I am stuck between the first 2 options, I is a good leaving group, but as far as H and OH put in the reactions I am confused on which to pick.
3. Regarding tert-butoxide as an E2 reaction, which statement is wrong.
- this base is more effective that ethoxide ion, becuase it (Ko-t- Bu) is more basic of the two.
- it is reactive in dimethyl sulfoxide that in tert-butyl alcohol.
- it will produce the more stable alkene.
- it favors E2 of Sn2
I think option 2 is wrong, but than again I think the third option is wrong as well.
4. To covert 2-bromobutane to 1-butene in the highest yeild. Which are the best reagents?
- KOH/H20
-KOH/CH3OH
-CH3ONa/CH3OH
-CH3CH2ONa/CH3CH2OH
-(CH3)3COK/(CH3)3COH
I know the first option is wrong, I think it is the 2nd one that deals with methonal.
5. Which of the following statments is/ are true of Sn2 reaction of (R)-2-bromobutane w/ hydroxide ion?
- Doubling the hydroxide ion concentration would double the rate of the reaction. ( assuming all other experimental conditions are unchanged.)
- The major product would be (s)-2-butanol.
- Doubling the concentration of (R)-2-bromobutane would double the rate of the reaction. (assuming all other experimental conditions are unchanged.)
- All of the above.
- Two of the above.
I think the third option is incorrect.
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ineedchemhelp
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Posts: 24
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Re: Some help for extra creit.
«
Reply #1 on:
June 26, 2008, 06:17:08 PM »
I figured out that question one is correct.
I have one more questions.
- The most specific term to describe the relationship between cis-3 hexene to trans- 3 hexene is:
1. stereoisomers
2. enatimoers
3. diastereomers
4. constitutional isomers.
I think is is constitutional isomers, but i always get confused with mirror images.
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cdementor
The Kind of Organic Chemistry
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Posts: 4
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Re: Some help for extra creit.
«
Reply #2 on:
June 26, 2008, 08:55:59 PM »
- The most specific term to describe the relationship between cis-3 hexene to trans- 3 hexene is:
1. stereoisomers
2. enatimoers
3. diastereomers
4
. constitutional isomers. Well done! Cis and trans isomeres of 3-hexene are constitutional isomers. others(option 2 & 3 deal with their miror image (optical isomers).
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ineedchemhelp
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Posts: 24
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Re: Some help for extra creit.
«
Reply #3 on:
June 26, 2008, 09:54:32 PM »
can someone help me these 4 questions? by varying the answer.
2. Which nucleophilic subs. reaction would be unlikely to occur?
- HO- + CH3CH2-I------> CH3CH2-OH+I
- I- + CH3CH2-H----> CH3CH2-I + H-
- CH3S- + CH3-Br---------> CH3S-CH3 + Br-
- all of the above would be unilkely to occur. I am stuck between the first 2 options, I is a good leaving group, but as far as H and OH put in the reactions I am confused on which to pick.
3. Regarding tert-butoxide as an E2 reaction, which statement is wrong.
- this base is more effective that ethoxide ion, becuase it (Ko-t- Bu) is more basic of the two.
- it is reactive in dimethyl sulfoxide that in tert-butyl alcohol.
- it will produce the more stable alkene.
- it favors E2 of Sn2 I think option 2 is wrong, but than again I think the third option is wrong as well.
4. To covert 2-bromobutane to 1-butene in the highest yeild. Which are the best reagents?
- KOH/H20
-KOH/CH3OH
-CH3ONa/CH3OH
-CH3CH2ONa/CH3CH2OH
-(CH3)3COK/(CH3)3COH
I know the first option is wrong, I think it is the 2nd one that deals with methonal.
5. Which of the following statments is/ are true of Sn2 reaction of (R)-2-bromobutane w/ hydroxide ion?
- Doubling the hydroxide ion concentration would double the rate of the reaction. ( assuming all other experimental conditions are unchanged.)
- The major product would be (s)-2-butanol.
- Doubling the concentration of (R)-2-bromobutane would double the rate of the reaction. (assuming all other experimental conditions are unchanged.)
- All of the above.
- Two of the above.
I think the third option is incorrect.
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c2h5o good leaving group
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2-bromobutane reaction koh with
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