Aligarh Muslim University (AMU) 2011 B.Sc Chemistry (Hons) Organic Chemistry-2010-11 - Question Paper
(4495)
2010-2011
B.Sc. (HONS.) (PART - II) EXAMINATION (CHEMISTRY)
ORGANIC CHEMISTRY (CH-212)
Maximum Marks: 26 Duration: Two Hours
Note: (i) Answer all questions.
(ii) Marks are indicated against each question.
(a) Write the product and ste involved in the following reactions. r P>v~(Q3)
either
(i) CH3 -C-CH3 + CH3MgBr *5* <1-L -
L
H H
(ii) C6H5 - C- C- CH3 He......>
I
ou 0(4 OH
H
Dil HNO,
(iii) f
(b) Answer any two of the following: (02)
(i) Acid and Base-catalyzed ring opening of epoxjdes.
(ii) Distinction between Primary, Secondary and Tertiary alcohols.
(iii) A method of formation of ether.
(c) Give a brief account of any one of the following: (02)
(i) Fries rearrangement
(ii) Reimer - Tiemann reaction
2. (a) With suitable example, explain the following reactions: (03)
(i) Baeyer - villager oxidation reaction
(ii) Cannizzaro reaction
(b) Give synthesis of the following compound using malonic ester: (02)
CW 3
ch3 -ch-ch2 -ch2cooh
(c) Out line the mechanism of any one of the following: (02)
(i) |Knoevenagel condensation
(ii) Witting reaction
OR
2'. (a) Give the structure of the product(s) formed in the following reactions: (03)
(i) 2HCHO-
50% NaOH room Temp
(ii) CH,iCHO + 2C;H:OH
(iii) CHCHO + NHOH >
c
Outline the mechanism of Benzoin condensation. (02)
(c) Give synthesis of the following compound using acetoacetic ester: (02)
ch3 O
CH3 - C h-ch2 -ch2 -c-ch3
3. Give an account of any three of the following: (2+2+2)
(i) Effect of substiluenfeon the acidity of carboxylic acids.
(ii) Hell-Volhard-Zelinsky reaction.
(iii) A method to prepare halo acids.
(iv) Relative stabilities of Carboxylic acid derivatives.
(v) Mechanism of esterification of carboxylic acids.
4. (a) Give mechanism of nucleophilic substitution in nitroarenes. (02)
(b) Describe a method to separate a mixture of Primary, Secondary and Tertiary (02) amines.
(c) How to prepare the following from benzene diazonium chloride: (02)
(i) Phenol
(ii) Bromobenzene
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| Earning: Approval pending. |
