KPK Board 12th class Chemistry Ch 20 Carboxylic Acids questions answers
We are providing all Students from 5th class to master level all exams preparation in free of cost. Now we have another milestone achieved, providing all School level students to the point and exam oriented preparation question answers for all science and arts students.
After Online tests for all subjects now it’s time to prepare the next level for KPK board students to prepare their short question section here. We have a complete collection of all classes subject wise and chapter wise thousands questions with the right answer for easy understanding.
We provided 12th class Chemistry short questions answers on this page of all KPK boards. Students of KPK boards can prepare the Chemistry subject for annual examinations.
In this List we have included all KPK boards and both Arts and Science students. These Boards students can prepare their exam easily with these short question answer section
Malakand Board 12th classes short questions Answer
Mardan Board 12th classes short questions Answer
Peshawar Board 12th classes short questions Answer
Swat Board 12th classes short questions Answer
Dera Ismail Khan Board 12th classes short questions Answer
Kohat Board 12th classes short questions Answer
Abbottabad Board 12th classes short questions Answer
Bannu Board 12th classes short questions Answer
All above mention KPK Boards students prepare their annual and classes test from these online test and Short question answer series. In coming days we have many other plans to provide all kinds of other preparation on our Gotest website.
How to Prepare KPK Board Classes Short Question Answer at Gotest
- Just Open the desired Class and subject which you want to prepare.
- You have Green bars which are Questions of that subject Chapter. Just click on Bar, it slides down and you can get the right answer to those questions.
- You can also Rate those question Answers with Helpful or not to make it more accurate. We will review all answers very carefully and also update time to time.
Now you can start your preparation here below
Acetic is also known as glacial acetic acid, because it can form an ice like solid when cooled. It is miscible with water, ether and ethanol. Acetic acid is a typical carboxylic acid and it gives all the reactions of this class.
Carboxylic acid exhibits hydrogen bonding between the two acids molecules as shown.
Thus the carboxylic acid exists as dimer in which two molecular have been associated in to one molecule. Thus the size of the molecule increased which account for the higher boiling points of carboxylic acid. No such type of diamerization takes place in alcohols. Thus carboxylic acids have high points as compare to corresponding alcohols.
Carboxylic acids are stronger acids then phenol, alcohols and water but less acidic then mineral acids. Because mineral acids are completely dissociated in aqueous solution while carboxylic acids dissociated partially in aqueous solution.
Phenol & Carboxylic acid: Carboxylic acids are more acidic then phenols because when acid losses it proton the acetate ion formed is more stable and the -ve charge is with more electronegative oxygen atom.
Phenol: Similarly when phenol losses its proton it gives phenoxide ion which is less stable though -ve charge is delocalized but in resonating structures. The -ve charge ion less electro-ve carbon atom due to which it has high energy and less stability.
Alcohol & Carboxylic Acid: Alcohols are les acidic then carboxylic acids, because when carboxylic acid dissociates it forms acetate ion which is resonance hydride. That’s why carboxylic acids are more acidic then alcohols.
Formic acid, Acetic acid
It is clear from the structures of both acetic acid and formic acid that Acetic acid has one alkyl group directly attached with carboxylic carbon and it will release electron to the carboxylate ion and thus tends to destabilized it as a result of which the loss of proton from acetic acid becomes difficult as compare to formic acid where a hydrogen atom is attached with carboxylic acid which is a electron attracting group i.e. why formic acid is more stronger acid as compare to acetic acid.
Chloroacetic acid is more acidic then acetic acid because chloride is more electronegative due to which it will attract electrons towards itself and hence the release of proton is easier. While is acetic acid the electron donating (CH) methyl group is attached which increase electron density on oxygen of (OH) group due to which release of proton become difficult hence it is a weak acid as compare to Chloroacetic acid
Carboxylic acids do not undergo addition reaction frequently as compare to aldehydes it is because in carboxylic acids acyl group CH-C is attached with hydroxyl group (OH) which is an electron donating group which will decrease the positive charge on the carbonyl carbon as compare to aldehyde where acyl group 15 attached with hydrogen (H) which not an electron donating group thus it do not neutralized the positive charge on carbonyl carbon making aldehydes more,susceptible to addition as compare to carboxylic acids.
Acids halides are the most reactive among all the derivatives of carboxylic acids because in all derivatives the Acyl group CHC -) is attached with electron donating groups which decreases positive charge on the carbonyl carbon except in acid halides where chlorine (halogen) is attached with acyl group which is electron withdrawing group and hence carbonyl carbon becomes more susceptible to nucleophilic attack as compare to the other derivatives. The order of reactivity is
Acid halide > Anhydride > Ester > Amides.
