Organic HELP PLEASE!!! 1. During the purification process after a reaction, the

Question

Organic HELP PLEASE!!!

1. During the purification process after a reaction, the neutralized mixture of dichloromethane and aqueous sodium bicarbonate are poured into a separatory funnel. Which is the bottom layer?

A. Dichloromethane is the bottom layer.

B. There is no bottom layer since aqueous sodium bicarbonate and dichloromethane are miscible.

C. There is not enough information to determine which is the bottom layer.

D. Aqueous sodium bicarbonate is the bottom layer.

2. The bromination of substituted benzenes is defined as what type of reaction?

A. electrophilic aromatic substitution

B. polymeric aromatic addition

C. aromatic esterification

D. nucleophilic aromatic substitution

3. Complete the following sentence. Activating substituents on a benzene ring __________.

A. withdraw electrons from the ring.

B. donate electrons to the ring.

C. contain at least one bromine atom.

D. do not affect the regioselectivity of subsequent reactions.

4. In the nitration of bromobenzene, the reason less meta product (m

Explanation / Answer

1. density of water = 1g/cc
density of CH2Cl2 = 1.32 g/cc

so dichloromethane will be on bottom

2. Electrophilic aromatic substitution ( if substitution is on benzene ring)

3.B donate electrons to benzene ring

4. answer should be : Bromo group is ortho para directing because of +Mesomeric effec

5.The bromine (Br2) has reacted with the benzene, leaving fewer bromine molecules in solution.

6.D. by adding a Lewis acid catalyst

7. mol wt of Bromobenze = 157

mol wt of nitrobenene = 202

so 202 g will be obtained from 1 mole

2.82 g will be obtained from 13.9 millimiles

8. density = 1.495

so mass = 1.495 X 8.8 = 13.156 g

mol wt = 157

so moles = 13.156 / 157 =0.837 moles

9. C. Sulfuric acid acts as a catalyst

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