Tilka Manjhi Bhagalpur University 2005 B.Sc Chemistry organic 6 - Question Paper

COPYRIGHT RESERVED AA(H-1)Ch(2A)


2005

Time: three hours

Full marks: 100

Candidates are needed to provide their ans in their own words as far as practicable.


(NEW SYLLABUS)

ans 5 ques. in which Q.No. one is compulsory

1.Select accurate ans for every of the subsequent ques. from the choices provided :2X10=10
(i)Milk is fermented by lactic acid by the microorganism:
(a) Rhizop
(b) Fenton's reagent
(c) Bacillus acidi lactiti
(d) Bacillus acidi lactiti

(ii) The identical osazones found from aldoscs having identical other than the alpha carbon are known as : .
(a) Diastereoisomers
(b) Structural isomers
(c) Enantiomers
(d )

(iii) Ethyl acetoacetate reacts with phenylhydrazine to form:
(a)A pyrazoione
(b )An iso-oxazolonc
(c )Dehydroaectic acid
(d)A 1:3 diacotone

(iv) Nylon - 66 is made from:
(a) Ethylene glycol and adipic acid
(h) Hexamethy\ene diamine and adipic acid
(c) Ethylenediamine and malonic acid
(d) None of these

(v) The fingerprint region in IR spectrum is in between:
(a) 3600-32
(b) 1500-667cm-1
(c.)2300-2100 cm-1
(d) None of the

(vi) Nylon-6is made from:
(a) 1, 3-Butadlcne
(b) Adipic acid
(c) Chloroprene
(d) Hydrolytic product of caprolactum

(vii) Reduction of benzene diazonium chloride with SnCl2 and NaOH gives:
(a) Phenol
(b) Phenylhydrazine
(c) Benzene
(d) Chlorobcn.

(viii)Trcatment of Phenol with CCl4 and KOH followed by acidificatic
(a) Benzoic acid
(b) Cl1lorobenzene
(c) Salicylic acid
(d) None

(ix) The condensation ranging from ethyl acetate and ethyl formate in presence of a base gives:
(a) a-Formylethyl acetate
(b) Ethyl aceto
(c) Ethyl aclohol
(d) None of the

(x) Action of methyl chloride upon ethylene in presence of anhydrous Alcl3 provide mainly:
(a) n-propyl chloride
(b) Iso-propyl chloride
(c) I. 3-Butadiene
(d) None of these


2 .. How is tartaric acid prepared from grape juice? How glyoxal is converted into a tartaric acid? Disuss its optical isomerism. [20]


3.Justify the following: [20]
(a) Phenol behaves as an acid
(b) Amides are not basics.
(c) Formic acid is stronger acid than acetic acid
(d) iV1cthyl amine is stronger base than aniline
(e) tvlethylene group in diethylma!omlte is vcry active.

4.What is diazotization ? How would you prepare phenayldryzine from anifiline
Under what condition can p-nitrotolune bc converted into p-cresol and p-tolutic acid ?

5.Describe the preparation of ethyl aceloacctate. From this compound how will you
synthesise the following: [10]
(a) Aniso-oxazoIonc
(b) Acety!acetone
( c) Glutaric acid
(d) 3-melhy 1-2 penta:',:..,
Or
(a)What in an Osazone?Why do D-gIucose and D-fructose provide the Osazone?
(b) How would you convert glucose into urabinose and vice-versa

6.How would you effect the subsequent transformations? [20]
(a) Nitrobenzene to m-chlorobenzoic acid
(b) Benzene to acetophenone
(c) Benzaldehyde to dynamic acid
(d) Phenol to salicylaldehyde

7.How aniline is found in the labrotary ?How does it react with the following: [20]
(a)Methyl iodine
(b)Acetyl chloride
(c)Nitrous acid in cold HCl
(d)A misture of cholorofm and alkali?Give equations

8. Write notes on 3 of the subsequent. [20]
(a)Addition polymerization
(b)Beer Lambert legal regulations
(c)Hook’s legal regulations

9. Write notes on 2 of the subsequent. [20]
(a)Friedal craft reaction
(b)kolbes reaction
(c)Sandmeyr reaction

Earning:   Approval pending.