Sn1 Lab Essay examples

743 Words Oct 30th, 2012 3 Pages
Experiment 3: SN1 – Report Sheet

Last Name:
Abbassi-Mohadjel | First Name:
Nora | Date: OCT. 26, 2012 | Section Number:
005 (Friday->1:35-5:35pm) |

Objective: 1 mark
(What is the purpose of this experiment?)

In this lab, spectrochemical technique was used to determine qualitively the product of a reaction. The purpose was to learn what a SN1 reaction was with combining 2,5-dimethyl-2,5-hexanediol and HCl and to learn how to use an infrared spectrum for analyzing the reaction. The infrared spectrum determined the alcohol content present in the final product. If the IR of a molecule with an alcohol is present, there will be an IR peak between 3400 and 3200 cm^-1. However, if the experiment was done successfully by
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Results – Yield and Physical Properties of 2,5-Dichloro-2,5-Dimethylhexane 5 marks | 2,5-Dichloro-2,5-Dimethylhexane | Yield (g) | 0.250g | Yield (%) | 96.2% | Appearance | White precipitate, very thick liquid | Melting Point | 62.0ºC - 65.0ºC |

Figure 1. IR Spectrum
Attach IR Spectrum of Your Starting Material (2,5-dimethyl-2,5-hexanediol) and Product (2,5-Dichloro-2,5-Dimethylhexane ) – label important stretching frequencies.

Discussion Questions: 10 marks

1. Suggest at least one chemical reason why your percent yield is less than 100%. (Incomplete reactions? Side reactions? Stability of reagents?)

Incomplete reactions could be a possible chemical reason to why the percent yield is less than 100%. During the procedure, the experiment might not have been mixed long enough for the Cl- ion to fully form.

2. SN1 and E1 reactions both involved the initial formation of a carbocation intermediate. In this experiment, why is the SN1 product favoured over the E1 product?

The SN1 mechanism leads to substitution products, and the E1 mechanism leads to formation of alkenes, therefore in this case, it is shown that this mechanism leads to a substitution of products since the Cl- ion is replacing the OH group by the addition of a strong acid (HCl). When the nucleophile

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