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Wednesday, July 7, 2021




 B.Sc. (Hons.) Biotechnology

1st Semester 

BIOT-Sem-I-IV-T: Chemistry

Time allowed: 3 Hours Max. Marks: 67 


NOTE: Attempt five questions in all including Q No.-IX (Unit-III) which is compulsory and select two questions each from Unit I-II.

UNIT-I 

1. (a) Draw molecular energy level diagram of NO molecule. Tell its bond order and magnetic behavior. 

(b) What are Scater Rules? State properly calculate the effective nuclear charge for one of the 4s electron of zinc atom.


II. (a) Explain the term ionization energy. What are the different factors on which it depends? 

(b) Define the following terms: - 

(i) Chemical shift 

(ii) Shielding and deshielding of protons 

(iii) Zero point energy 

(iv) Stokes and anti stokes lines


III. (a) Differentiate ideal and non-ideal solutions. 

(b) Derive the relation between freezing point depression of solution and mole fraction of the dissolved solute. 

(c) Calculate osmotic pressure at O'C of a 5% solution of urea (mol. wt=60) (R=0.0821 lit-at/deg/mol).


IV. (a) Discuss in detail effect of catalyst on rate of reaction. 

(b) Differentiate order and molecularity. 

(c) Explain the effect of temperature on reaction rate in terms of Arrhenins equation.



UNIT-II 

(V) (a) State and explain Stark-Einstein law of photochemical equivalence. What do you mean by molar extinction coefficient? 

(b )Define and explain the terms Fluorescence and phosphorescence properly.


VI. (a) Explain the basic postulates of Werner's coordination theory.

(b) Write IUPAC names of the following: 

(i) K[Hg1] 

(ii) (Colen), CI, Br 

(iii) (CH(NH) 

(iv) LAH) 

(v) [Co(NH,),CI] 

( c )Explain with help of examples, geometrical isomerism in complexes having coordination number six. (5+5+3)


(VI )Differentiate inductive effect and electrometric effect. 

( b) Discuss and compare and sy reactions with help of mechanisms. 

( c )Write a note on structure, methods of preparation, and reactivity of singlet and triplet carbenes. (3+6+4)


VIII. (a )How will you account for the fact that acid chlorides are most reactive and acid amides are least reactive towards nucleophilic substitution reactions? Justify.

(b) Write and explain the mechanism of the following reactions: 

(i) Esterification 

(ii) HVZ reaction (7+6)


UNIT-III 

IX. Attempt the following: - 

(a) Define linkage isomerism in coordination complexes with one example. 

(b) Write the units of the rate constant for the first and second-order reaction. 

(c) What do you mean by activation energy? 

(d) Explain Allred and Rochow scale of electronegativity.

(e ) Tell three centred electron pair bond with example. 

( f) Explain briefly hyperconjugation.

( g) Briefly explain the terms transmittance and absorbance. 

(h) Which gas is commonly known as stranger gas?





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