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USE THE DATA AND ANSWERS THE QUESTION WITH WITH TICK MARK.ANSWER ALL THE TEST REACTION USING THOSE

QUESTION


THE NATURE OF LEAVING GROUP

THE EFFECT OF STRUCTURE

THE EFFECT OF SOLVENT

THE EFFECT OF TEMPERATURE





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Test with solvent polarily . -
1 ) get 1 test tube
2) place & Drops of 2 - Br-Butane
3) Add I'ml of 1%. silver nitrate in 50./ water, 50%.
ethanol solution
4 ) Mix and note time of any trace precipale
5) If no reaction after 5ming, place in 50'c water bath
watch for reaction ( 5 -6 mins more ). If still moreaction
mark as mo reaction.
Observation :-
Test NAI in acetone:
Group I:-
1 BN Butane
2 Br Butane
doudy ppt
3 seconds
t - Buty / BN
Aromatic Br
Immedia
cloudy ppt
25 seconds
yellowp
ppt
30 Seconds
Smin Noreachon
Groupit
Timing
Later Bath Yellow PPt
1 - CLBUFave
I-CL 2 - mepropane
Immediately
+- Butyl EL
6 Seconds
8 Seconds
Group Ill
For 13 utore
2 - Br Butone
3 Seconds
25 second
1 - CL Butane
Immediately
2 - CL Butome
5min Noreaction
Bath
Signature
Date
Witness/TA
Date
THE HAYDEN-MCNEIL STUDENT LAB NOTEBOOK
Note: Insert Divider Under Copy Sheet Before Writing

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Name
Lab Partner
Locker/
Desk No.
Course &
Section No.
Reaction with Ethanolic Silver nitrate :-
Group I
1 - BN Butone
2 - Br Butane
Immediately pp
t - Butyl Br
50 second
Br - Benbiene
Imediately ppt
No reaction
GroupIT
Timing
1-CL Butane
1 - CL 2 - mepropane
20 second
+ - Butyl CU
40 seconds
[mediatly
Group I
Timing
1 - Br Butare
2 - BrButome
1 min 2sec .
1 - CL Butane
80 Sec
2 - CL Butave
Smin noseeact give batce ppt form cloudy
5min nowreact dive bath pot form cloudy
For 2 - Bo Butane + 1%. AgNO, in 50% ethanol for polaricy
effect on rate = Separate Layers, 80 Second opt X
Signature
Date
Witness/TA
Date
THE HAYDEN-MCNEIL STUDENT LAB NOTEBOOK
Note: Insert Divider Under Copy Sheet Before Writing

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groupings described above. Add 1 mL of 1% ethanolic silver nitrate
solution to each tube, mix the contents well, and note the time of addition as well
as the time of appearance of the first traces of any precipitate. If a precipitate does
not appear in 5 minutes, heat the tubes containing these unreactive halides in a
50 C water bath for 5 to 6 minutes and watch for any reaction.
To test the effect of solvent on the rate of S 1 reactivity, compare the time
needed for a precipitate to appear when 2-chlorobutane is treated with a 1% ethano-
lic silver nitrate solution, and when treated with 1% silver nitrate in a mixture of
50% ethanol and 50% water.
In your analysis of the results from these experiments, consider the following
for both S 1 and S, 2 conditions:
the nature of the leaving group (Cl vs. Br) in the 1-halobutanes
the effect of structure, that is, compare simple primary, secondary, and tertiary
halides, unhindered primary vs. hindered primary halides, a simple tertiary
halide vs. a complex tertiary halide, and an allylic halide vs. a tertiary halide
custom page
147

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Lab 10: Nucleophilic Substitution Reactions of Alkyl Halides
s of Alkyl Halides
the effect of solvent polarity on the Sy1 reaction
the effect of temperature on the reaction
b Links
Cleaning Up. Because all of the test solutions contain halogenated material, all tes
solutions and washes as well as unused starting materials should be placed in th
halogenated organic waste container.
IONS
1. What would be the effect of carrying out the sodium iodide in acetone reactic
with the alkyl halides using an iodide solution half as concentrated?
2. The addition of sodium or potassium iodide catalyzes many S, 2 reactions

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