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Phenolphthalein is an acid–base indicator that is

Organic Chemistry | 8th Edition | ISBN: 9780321768414 | Authors: L.G. Wade Jr ISBN: 9780321768414 33

Solution for problem 23P Chapter 15

Organic Chemistry | 8th Edition

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Organic Chemistry | 8th Edition | ISBN: 9780321768414 | Authors: L.G. Wade Jr

Organic Chemistry | 8th Edition

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Problem 23P

Problem 23P

Phenolphthalein is an acid–base indicator that is colorless below pH 8 and red above pH 8. Explain briefly why the first structure is colorless and the second structure is colored.

Step-by-Step Solution:

Solution:

Here we have to explain why phenolphthalein of pH<8 is colorless and pH >8 is red.  

Step 1

In the compound A, the central C-atom is sp3, hybridized and this carbon atom is attached to the lactone ring oxygen. Due to the lack of delocalization in the molecule , it is colour less in acidic medium.

Step 2 of 2

Chapter 15, Problem 23P is Solved
Textbook: Organic Chemistry
Edition: 8
Author: L.G. Wade Jr
ISBN: 9780321768414

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Phenolphthalein is an acid–base indicator that is