Organic Chemistry Answers

What is the molecular formula for a hydrocarbon with 10 carbons that is (a) completely saturated (b) alkene (c) alkyne

3. If iron filings were an impurity present along with the ASA in this

experiment, at which point in the recrystallization procedure would they

be removed completely from the ASA? (What slide numbers show this

procedure?)

4. What is the purpose of adjusting the polarity in slide 19 of the slide

presentation?

5. Would benzoic acid dissolve better in water, or in ethanol? Explain why

using the concepts discussed in this laboratory.

1. In a final very careful and correct recrystallization from acetone, benzoic acid (pure mp 122-122.3°C) was melted on a melting point machine immediately after vacuum filtration and washing, and found to have a melting point of 116-121°C. Why is the melting point not 122-122.3°C? Assume that there are no solid compounds present other than benzoic acid present, and suggest what may be present to affect melting point, and what role that presence does.

2. What are 2 advantages of using gravity filtration over vacuum filtration when removing a solid impurity from a hot mixture? 

1. Provide the possible candidate ion/s for the primary adsorbed layer of a colloid formed when small amounts of silver nitrate is added to a solution of potassium chromate by accounting the following five factors: solubility, concentration, common ion, ion charge and ion size. Write the colloid formula.

Are ketones part in the acyl group?

Compare the mechanisms for the following substitution and addition reactions of benzene:

o   the Friedel-Crafts reaction 

o   the sulfonation of benzene

o   the chlorination of benzene 

o   the hydrogenation benzene

You will need to illustrate and explain the reaction mechanism for each one, as well as the similarities and differences that exist between them.

Could you list some similarities and differences for the mechanisms please?

Draw the cis- and trans- forms of 1, 3-dimethylcyclobutane. Which one of these

(i) will be polar in nature?

(ii) has higher melting point?

Explain your answer giving reasons.

Compare the mechanisms for the following substitution and addition reactions of benzene:

o   the Friedel-Crafts reaction 

o   the sulfonation of benzene

o   the chlorination of benzene 

o   the hydrogenation benzene

You will need to illustrate and explain the reaction mechanism for each one, as well as the similarities and differences that exist between them.

could you list some similarities and differences between them please?

The unbalanced equation for the reaction of hydrochloric acid with magnesium hydroxide is shown. ___HCl + ___Mg(OH)₂ → ___MgCl₂ + ___H₂O When the equation is balanced, what is the coefficient for H₂O?

Compare the mechanisms for the following substitution and addition reactions of benzene:

o   the Friedel-Crafts reaction 

o   the sulfonation of benzene

o   the chlorination of benzene 

o   the hydrogenation benzene

You will need to illustrate and explain the reaction mechanism for each one, as well as the similarities and differences that exist between them.

Could you list some similarities and differences for each mechanisms please?