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Friday, January 7, 2022

Download "Chemistry - Organic Chemistry-B " Question Paper PDF of B.Sc. 4th Semester Previous Years Paper for Students.




B.Sc. (General) 4th Semester
Chemistry 
(Same for B.Sc. Microbial and Food Technology)
Paper: Organic Chemistry-B 



Time Allowed: Three Hours 

Maximum Marks: 22

Note: - Attempt five questions in all, selecting one question from each Unit. Unit-V is compulsory.


UNIT-I 

(a) Write IUPAC names of the following: 

(i) COOH

COOH 


(ii) CH3-CH-CH2-COOH

C6H5


(b) Why carboxylate ion is more stable than carboxylic acid? Discuss.


(a) Convert:

    (i) Acrolein into Acrylic acid 

    (ii) Acrylic acid into 2,3-dibromoprepanoic acid.


UNIT-V 


(i) Flouroacetic acid is a stronger acid than chloroacetic acid. 

(ii) Why C-O bond lengths in carboxylic acids are equal? 

(iii) Write the order of basic character of methylamine in the aqueous phase.

 (iv) Formula of Hinsberg reagent. 

(v) Write the equation to show that Cut2 gives blue colour with ethyl amine. 

(vi) During nitration of arenes, what is electrophile in the nitrating mixture (Conc. HNO, +H,50.)?









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