Chemistry Generic DSC/Elective course Chemistry first semester (Atomic structure,Bonding,General organic chemistry and Alphatic Hydrocarbon)

 

               CHEMISTRY 2022 First Semester CBCS Dibrugarh University

(Generic Elective/Discipline Specific Cours )

{Atomic is Structure ,Bonding ,General Organic Chemistry and Aliphatic Hydrocarbons}  

UNDER DIBRUGARH UNIVERSITY     

               

          

Inorganic Chemistry

1.Choose correct answer from the following.

(a)The hybridation involved in NHᴴ4 following.

(i)sp2   (ii)spᶾ (iii)spᶾd (iv)sp

(b)Which of the following atoms has no unpaired electron?

(i)N  (ii)F (iii)Na (iv)Ne

(c)Which of the  following has the minimum bond length ?

(i)N₂   (ii)N₂⁺  (iii)N₂̄ (iv)N⁺₂

2.Answer the any three of the following questions:

(a)Write the electronic configuration of the following ions :

(i)Sc⁺₂

(ii)Cu⁺₂

(b)Write down the postulates of Bohr’rs theory .

(c)Wite down the postulates of molecular orbital theory.

(d)Draw the reasonating structure for the following question  two molecular ions:

                          NOз̄,C₆H₅O ˉ

3.Answer any two of the following questions:

(a)Explain the structure of XeF₆ on the basis of VSEPR theory.

(b)H₂O molecules is polar but BCIз is non-polar.Give Reasons.

(c)What is lattice energy?How does lattice energy control the solubility of ionic compound?

4.Answer the following questions:

(a)Explain the Pauli’s exclusion principle with reference to He Atom.

(b)Express the Schrodinger’s wave equation for H-Atom in terms of polar coordinate.

5.Write short notes on the following :

(a)Faja’s Rule

(b)Heisenberg’s uncertainty principle.

 

Organic Chemistry

6.Choose the correct answer  from any four of the following .

(a)The acidity order amongst ethane,ethylene and acetylene is

(i)H₂C=CH₂<CH₂₌ˉCH<HзC-CH₂

(ii)HзC-CHз<H₂C=CH₂<˭HC=CH

(ii)HC=CH<HзC-CH₂<HC=CH

(iii)HC=CH<HзC-CHз<H₂C=CH₂

(IV)None of the above.

(b)Which of the following aminee is the weakest base ?

(i)(CHз)зN

(ii)NHз

(iii)(CHз)₂NH

(iv)HзC-NH₂

(c)Find out the nucleofiles from the following compounds :

(i)CN

(ii)H₂ὃ:

(iii)BFз

(iv)(HзC)зNH

(v)AICIз

7.Answer any three of the following question:

(a)What is carbocation ?Give an example and arrange 1⁰̄ˍ,2⁰ˍ and 3⁰ˍ carbocationns on the basis of their stability.

(b)Write a short note on any one of the dollowing:

(i)Homolytic and heterolytic bond fission.

(ii)Resonance

(c)What are nitrenens?How are they generated ?

(d)What do you mean by aromatic and benzeneoid compounds ?According to Huckel’s  rule (4n+2)pie  basis compound.

8.(d)Discuss the difference between geometrical and optical isomers.

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(e)What do you mean by axial and equatorial hydrogen ?Draw the chaird form of cyclohexane and indicate the both types of hydrogen.

(f)Explain with example,the difference between conformation and configuration.

(g)What are the condition followed by a compound to show optical isomerism?Discuss with example.

9.According to instruction,answer the following questions :

(a)Answer any two of the following question:

(i)How is corey-House reaction used for preparation of alkane ?Excplain with example .

(ii)What happens when sunlight is passed through the mixture of methane and chlorine gas ?Write the chemical reaction and its mechanism.

(iii)Write with mechanism the cis-hydroxylation of alkene.

(iv)What happens when acetylene is passed through red hot copper tube ?Write with reaction.Is Markovnikovs rule applicable in case of acetylene ?

 

 

chemistry question paper 2023/Bsc QuestionPaper 1st sem

 chemistry question paper 2022