Flashcards
phenols
Cards in this deck (18)
- 1phenolsphenols are organic aromatic hydroxy compounds in which one or more hydroxyl group is directly attachec to the carbon of the aromatic sysTEm.
- 2due to ability to neutralize common bases also known asCARBOLIC ACID
- 3NAPTHANOL
- 4cresol
- 5catechol
- 6resorcinol
- 7quinol or hydroquinone
- 8phloroglucinol
- 9pyrogallol
- 10structure of phenolin phenol group the oh is attached to sp2 hybridised CARBON .....the bond lenth bw c-o is small than methanol due to
1) partial double bond charac
2) sp2 carbon attached to O
- 11physcial properties- colorless
-crysalline solid
-charac smell = phenolic / carbolic odour
-mp=315k -bp=455k
-sparingly soluble in h2o
-weak acid ,weaker than carbonic acid
-turns pink in air light due to formation of quinones - 12resonating structure of phenolin alcohols -oh attached to sp3 C
in phenols - oh attached to sp2 C
- 13resonating structure of phenoxide ion
- 14phenol or phenoxide which is more stablephenoxide .
AS in phenol oxygen has a + charge being electronegative.
in phenoxide oxygen has a positive charge - 15in alcohol and alcohol oxide which is stablealcohol.
as nuetral species are more stable than charged - 16salicylic acid
- 17phenol is found inmiddle oil, acidic fraction of coal tar distillate
- 18phenols imp points* -oh group is called phenolic group
* -the group activates ortho and para positions of benzene ring as these positions become electron rich due to resonance effect
* -mixture of ortho and para
* -bifunction compound due to it undergoes reaction due to oh and electrophilic substituion .
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- sat CHEMISTRY Flashcards on phenols, created by arwk on 25/10/2014.
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- arwk
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