Quiz4A - 1 CHM 2123 Quiz#4 The Nitration of Chlorobenzene...

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1 CHM 2123, Quiz #4: The Nitration of Chlorobenzene Assigned: October 5th, 2006 Due: Tuesday, October 10 , 2006, before 5pm MARKING SCHEME 1. In this experiment, you must work with concentrated acids. Supposing that you had to dispose of a surplus of acid by diluting it with water, what would you do? Adding water to the acid or vice-versa? (1 point) Adding water to concentrated acid is very exothermic. It is therefore better to add the acid to water. Water to acid = suicide; acid in water = super! 2. The nitration of nitrobenzene at room temperature gives 1,3-dinitrobenzene, but not 1,3,5-trinitrobenzene, despite the use of excess reagents. Why is the reaction selective? (3 points) NO 2 NO 2 NO 2 O 2 N NO 2 O 2 N HNO 3 , H 2 SO 4 r.t. HNO 3 , H 2 SO 4 r.t. The nitration of nitrobenzene is an electrophilic aromatic substitution. The presence of two strongly electron-withdrawing groups (deactivating groups) on the aromatic ring makes the compound strongly deactivated. This deactivation considerably slows the
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This note was uploaded on 01/25/2011 for the course MAT 1330 taught by Professor Dumitriscu during the Spring '08 term at University of Ottawa.

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Quiz4A - 1 CHM 2123 Quiz#4 The Nitration of Chlorobenzene...

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