Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage Learning
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Chapter 31, Problem 31.8QAP
Interpretation Introduction
Interpretation:
The chemical changes associated with endothermic and exothermic peaks in differential scanning calorimetry and differential thermal analysis are to be listed.
Concept introduction:
Determination properties of materials are done on the basis of change of temperature and it is known as thermal analysis. Many methods are there as example DSC or DTA etc.
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1,4-Dimethyl-1,3-cyclohexadiene can undergo 1,2- or 1,4-addition with hydrogen halides. (a) 1,2-Addition i. Draw the carbocation intermediate(s) formed during the 1,2-addition of hydrobromic acid to 1,4-dimethyl-1,3-cyclohexadiene. ii. What is the major 1,2-addition product formed during the reaction in (i)? (b) 1,4-Addition i. Draw the carbocation intermediate(s) formed during the 1,4-addition of hydrobromic acid to 1,4-dimethyl-1,3-cyclohexadiene. ii. What is the major 1,4-addition product formed from the reaction in (i)? (c) What is the kinetic product from the reaction of one mole of hydrobromic acid with 1,4-dimethyl-1,3-cyclohexadiene? Explain your reasoning. (d) What is the thermodynamic product from the reaction of one mole of hydrobro-mic acid with 1,4-dimethyl-1,3-cyclohexadiene? Explain your reasoning. (e) What major product will result when 1,4-dimethyl-1,3-cyclohexadiene is treated with one mole of hydrobromic acid at - 78 deg * C ? Explain your reasoning.
Give the product of the bimolecular elimination from each of the isomeric halogenated compounds.
Reaction A
Reaction B.
КОВ
CH₂
HotBu
+B+
ко
HOIBU
+Br+
Templates More
QQQ
Select Cv Templates More
Cras
QQQ
One of these compounds undergoes elimination 50x faster than the other. Which one and why?
Reaction A because the conformation needed for elimination places the phenyl groups and to each other
Reaction A because the conformation needed for elimination places the phenyl groups gauche to each other.
◇ Reaction B because the conformation needed for elimination places the phenyl groups gach to each other.
Reaction B because the conformation needed for elimination places the phenyl groups anti to each other.
Five isomeric alkenes. A through each undergo catalytic hydrogenation to give 2-methylpentane
The IR spectra of these five alkenes have the key absorptions (in cm
Compound
Compound A
–912. (§), 994 (5), 1643 (%), 3077 (1)
Compound B 833 (3), 1667 (W), 3050 (weak shoulder on C-Habsorption)
Compound C
Compound D)
–714 (5), 1665 (w), 3010 (m)
885 (3), 1650 (m), 3086 (m)
967 (5), no aharption 1600 to 1700, 3040 (m)
Compound K
Match each compound to the data presented.
Compound A
Compound B
Compound C
Compound D
Compound
Chapter 31 Solutions
Principles of Instrumental Analysis, 6th Edition
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