Organic Chemistry Answers

The determination of copper in a seawater sample gave a mean value of 77.81 mg/L and a standard deviation ss of 1.74 mg/L. (Note: the insignificant figures were retained here because these results are used below in another calculation.) How many samples must be analyzed to obtain a relative standard deviation of 1.7% in the results at the 95% confidence level? (Show your solution)

A container contains 2.5m³ of Helium gas at 15°C and 98 Nm

Show the Lewis Structure and geometric sketch for HCN.

The electronegativities of H, C, and N are 2.20, 2.55, and 3.04. Is the molecule Polar? Support your answer.

there are three ketone isomers with the formula C₅H₁₀O . Draw their structures

Show how you would produce N-ethyl-N-isopropylethanamide starting with ammonia, an organohalide (alkyl halide), and an alcohol.

Which of the following alcohols CANNOT be oxidized? 

1. 3-methylbutan-3-ol
2. methanol
3. ethanol
4. octan-5-ol
5. butan-2-ol

How to prepare 100ml of 2 molal NaCl solution..?

The handbook must next have a section on mechanisms, in which you which will construct and analyse an example of each of the following reaction mechanism types:

•          Addition e.g. aldehyde or ketone with HCN

•          Substitution e.g. halogenoalkane with aqueous NaOH

•          Elimination e.g. halogenoalkane with ethanolic NaOH

•          Addition-elimination e.g. aldehyde or ketone with 2,4-dinitrophenylhydrazine

This section must explore and interpret the similarities and differences between each of the four mechanisms.

For the final section, use relevant information from the other sections of your handbook, to give a plan of a multi-step synthesis of

•          ethyl ethanoate (CH₃CO₂CH₂CH₃), starting from ethanol and ethanal

•          N-ethylacetamide (CH₃CONHCH₂CH₃), starting from chloroethane and ethanoyl chloride

You will need to include reagents, reaction conditions and intermediate products involved in each step

Shows plans of the multi-step synthesis routes for a) ethyl ethanoate (CH₃CO₂CH₂CH₃), starting from ethanol and ethanal and b) N-ethylacetamide (CH₃CONHCH₂CH₃), starting from chloroethane and ethanoyl chloride;