Chemistry Homework Help<br />An Overview<br />Assignmenthelp.net<br />
Alcohols , Phenols and Ethers<br />Alcohols and  phenols are classified <br />   (i) on the basis of the number of hydroxy...
Alcohols may be prepared :<br />  (a) by hydration of alkenes<br /> (i) in presence of an acid and (ii) by hydroboration-o...
Alcohols are higher boiling than other classes of compounds, namely hydrocarbons, ethers and haloalkanes of comparable mol...
Alcohols and phenols are acidic in nature.  Electron withdrawing groups in phenol increase its acidic strength and  electr...
Dehydration of alcohols gives alkenes. <br />On oxidation, primary alcohols yield aldehydes with mild oxidising agents and...
The presence of –OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incomi...
Ethers may be prepared by (i) dehydration of alcohols and (ii)  Williamson synthesis.<br /> The boiling points of ethers r...
 The C–O bond in ethers can be cleaved by hydrogen halides.<br /> In electrophilic substitution, the alkoxy group activate...
For further info<br />http://www.assignmenthelp.net<br />+1-617-874-1011 (USA)    +44-117-230-1145 (UK)      +61-7-5641-01...
Upcoming SlideShare
Loading in...5
×

Chemistry Assignment/Homework Help Services

1,222

Published on

Quality Chemistry Assignment Help Services of Assignmenthelp.net's are best. You can find more information about Chemistry, Chemical Reactions, Chemical Bonding, and Mole Concept from our expert chemistry tutors.

Published in: Education, Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,222
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
33
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Chemistry Assignment/Homework Help Services

  1. 1. Chemistry Homework Help<br />An Overview<br />Assignmenthelp.net<br />
  2. 2. Alcohols , Phenols and Ethers<br />Alcohols and phenols are classified <br /> (i) on the basis of the number of hydroxyl groups and<br /> (ii) according to the hybridization of the carbon atom, sp3 or sp2 to which the –OH group is attached.<br /> Ethers are classified on the basis of groups attached to the oxygen atom.<br />
  3. 3. Alcohols may be prepared :<br /> (a) by hydration of alkenes<br /> (i) in presence of an acid and (ii) by hydroboration-oxidation reaction.<br />(b) from carbonyl compounds by<br /> (i) catalytic reduction and (ii) the action of Grignard reagents. <br />Phenols may be prepared by<br /> (a) substitution of (i) halogen atom in haloarenes and (ii) sulphonic acid group in aryl sulphonic acids, by –OH group.<br /> (b) by hydrolysis of diazonium salts.<br /> (c) industrially from cumene<br />
  4. 4. Alcohols are higher boiling than other classes of compounds, namely hydrocarbons, ethers and haloalkanes of comparable molecular masses. <br /> The ability of alcohols, phenols and ethers to form intermolecular hydrogen bonding with water makes them soluble in it.<br />
  5. 5. Alcohols and phenols are acidic in nature. Electron withdrawing groups in phenol increase its acidic strength and electron releasing groups decrease it.<br /> Alcohols undergo nucleophilic substitution with hydrogen halides to yield alkyl halides.<br />
  6. 6. Dehydration of alcohols gives alkenes. <br />On oxidation, primary alcohols yield aldehydes with mild oxidising agents and carboxylic acids with strong oxidising agents while secondary alcohols yield ketones.<br /> Tertiary alcohols are resistant to oxidation.<br />
  7. 7. The presence of –OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect.<br /> Reimer-Tiemann reaction of phenol yields salicylaldehyde. <br />In presence of sodium hydroxide, phenol generates phenoxide ion which is even more reactive than phenol.<br /> Thus, in alkaline medium, phenol undergoes Kolbe’s reaction<br />
  8. 8. Ethers may be prepared by (i) dehydration of alcohols and (ii) Williamson synthesis.<br /> The boiling points of ethers resemble those of alkanes while their solubility is comparable to those of alcohols having same molecular mass. <br />
  9. 9. The C–O bond in ethers can be cleaved by hydrogen halides.<br /> In electrophilic substitution, the alkoxy group activates the aromatic ring and directs the incoming group to ortho and para positions.<br />
  10. 10. For further info<br />http://www.assignmenthelp.net<br />+1-617-874-1011 (USA) +44-117-230-1145 (UK) +61-7-5641-0117 (AUS)<br />support@assignmenthelp.net<br />http://www.assignmenthelp.net/rss.xml<br />http://assignmenthelp.net/Assignment_Help_Podcasts/Poderator.xml<br />
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×