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Criteria of purity of organic compounds

7 years ago

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After purification, the test of purity of an organic compound is the nest important step. A pure organic compound possesses characteristic physical properties such as refractive index, specific gravity, boiling point, crystalline structure and melting point. If a purified sample shows the same properties that the pure substance is known to possess, it may be considered as pure and no further purification is required. However for practical purpose in laboratory only melting point and boiling point are used as criteria for purity.


A pure organic solid has a definite and sharp (sudden, rapid and complete) melting point, while an impure substance has a lower and indefinite melting point.


The melting point of a solid may be defined as the temperature at which the solid and liquid states of the compound are in equilibrium with each other at an external pressure of l atmosphere.

7 years ago

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poisonous allotope of phosphorus is?
 
 
white phosphorus
 
pa1 8 months ago
 
white phosphorus
 
SAIMANIKANTA 8 months ago
 
white phosphorus
 
SEELA YUVARAJU 8 months ago
IUPAC NAME OF THE THIS ORGANIC COMPOUND BUTERALDEHYDE?PLEASE TELL ME.
 
 
Butyraldehyde is an organic compound with the formula CH 3 (CH 2 ) 2 CHO. IUPAC name of this compound is Butanal. This compound is the aldehyde derivative of butane . It is a colourless...
 
Prabhakar ch 4 months ago
 
Hello Sathya Narayana The formyl group is a functional group, with the structure R-CHO, consisting of a carbonyl center (a carbon double bonded to oxygen) bonded to hydrogen and an R group, ...
 
Gaddam Chethan 4 months ago
 
hello raju Butyraldehyde is an organic compound with the formula CH 3 (CH 2 ) 2 CHO. IUPAC name of this compound is Butanal. This compound is the aldehyde derivative of butane . It is a...
 
raj kumar 4 months ago
The reducing agent in clemson reduction is ….….….….….….?????????????????
 
 
Dear Kumar Clemmensen reduction is a chemical reaction described as a reduction of ketones (or aldehydes) to alkanes using zinc amalgam and hydrochloric acid. This reaction is named after...
 
Prabhakar ch 4 months ago
 
Hi kumar, The reducing agent in clemson reduction is Zn-Hg / conc. HCl....................................................................
 
Gowri sankar 4 months ago
 
Clemmensen reduction is a chemical reaction described as a reduction of ketones (or aldehydes) to alkanes using zinc amalgam and hydrochloric acid. This reaction is named after Erik...
 
ULFAT 2 months ago
WHAT IS THE ANSWER?
 
 
Answer is 1200 Option is D .
 
PRAPULPODISHETTI 9 months ago
 
Dear PRAPULPODISHETTI, Please paste complete answer in one attempt so that questioner does not get mails on your each and every answer. This irritates the questioner and we are getting lot...
 
Forum Team 8 months ago
 
Dear Edhla Lokesh, Please ype the question completely here instead of asking it in an attachment so that other students who will be looking for answer to this question can get this page in...
 
Forum Team 8 months ago
Please send me the answer....Question is in image....
 
 
Dear Sai Sardar You are not sent an image please send it again correctly all the best for your bright future
 
Prabhakar ch 5 months ago
 
We are not able to see your image please send image which is less than 200kb try to resend the image. Thankyopu. still you are not send image try to send image correctly. bye all the best...
 
raj kumar 4 months ago
 
Dear sai sardar, Still you are not send the image try to send the image in the question.....................................................................................
 
Gowri sankar 4 months ago
16 th group elements called as picogens.why they called so
 
 
Dear Nareah raju, 15 th group elements are called pnicogens,your question is wrong...please check it...and then post the qurstion.
 
SAI SARDAR 5 months ago
 
Hello Users, We noticed that students are copy and pasting the same answer (T.kumar, gowri shankar) as posted by previous users and questioner is approving all the answers. This comes under ...
 
Forum Team 4 months ago
 
hai this is naresh raju thanks for u r answer to me. please tell why 15 th group elements called sas picogens
 
naresh raju 5 months ago
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