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IGNOU Organic Chemistry : CHE-05 December, 2017
Note: Answer all the four questions.
Q1. Write the IUPAC names of any two of the following:
Ans. Same as Chapter-5, Q.No.-4 and Q.No.-5 CLICK
Q2. Attempt any five of the following:
(a) Give chemical reactions for the following:
(i) Wittig reaction
Ans. Refer to Chapter-14, Q.No.-9 CLICK
(ii) Diels-Alder reaction
Ans. Dec-2013, Q.No.-2(a) (i) CLICK
(b) Which will be more easily nitrated – benzene or nitrobenzene? Give reasons why.
Ans.
(c) How many peptide bonds will be present in a tripeptide? Show these bonds by drawing the structure.
Ans. Two peptide bonds will be present in a tripeptide.
Now, Refer to Chapter-20, Q.No.-19 CLICK
(d) Which one will be more acidic and why?
(i) Phenol
Ans. Phenol will be more acidic. CLICK
(ii) 4-Nitrophenol
Ans. Refer to Chapter-12, Q.No.-12 CLICK
(e) Aldehydes reduce Tollen’s reagent whereas ketones do not. Explain.
Ans. Refer to Chapter-14, Q.No.-10 CLICK
(f) Briefly explain octane number and give its importance.
Ans. Refer to Chapter-6, Q.No.-2(3) CLICK
(g) (i) State Huckel’s rule.
Ans. Refer to Chapter-9, Q.No.-5 CLICK
(ii) Define saponification value.
Ans. Refer to Chapter-20, Q.No.-29 (ii) CLICK
Q3. Attempt any five of the following:
(a) How can you convert the following in a single step?
(i) Phenol to benzene
Ans. CLICK
(ii) Nitrobenzene to aminobenzene
Ans. CLICK
(iii) Ethene to ethane-1, 2-diol
Ans. CLICK
(b) Draw the most stable and the least stable conformations of cyclohexane. Also explain their relative stabilities.
Ans. Refer to Chapter-3, Q.No.-12 CLICK
(c) What are Grignard reagents? Give two examples of their use in organic synthesis.
Ans. Now, Refer to Chapter-11, Q.No.-18 CLICK
(d) What is diazotisation? Give its any two uses.
Ans. Refer to Chapter-12, Q.No.-5 CLICK
(e) Position 2 is preferred for nucleophilic substitution in pyridine. Explain.
Ans. Refer to Chapter-10, Q.No.-12 CLICK
(f) State three important differences between DNA and RNA.
Ans. Refer to Chapter-20, Q.No.-22 CLICK
(g) Why is TMS used as a reference standard in ?
Ans. Refer to Dec-2013, Q.No.-2(g) CLICK
Q4. Attempt any five of the following:
(a) Complete the following reactions and name the main products formed:
For Full Answer CLICK
(b) What is the significance of ozonolysis? Give the products of the ozonolysis of the following:
Also, name the products.
Ans. Refer to Chapter-7, Q.No.-8 CLICK
(c) (i) Write the structure of an isoprene unit and give its IUPAC name.
Ans. Refer to Chapter-20, Q.No.-24 CLICK
(ii) Give one major difference between a nucleotide and a nucleoside.
Ans. For Full Answer CLICK
(d) Briefly explain the following:
(i) Amphoteric nature of amino acids
Ans. Refer to Chapter-16, Q.No.-8 CLICK
(ii) Isoelectric point
Ans. For Full Answer CLICK
(iii) Tautomerism
Ans. Refer to Chapter-2, Q.No.-2 CLICK
(iv) Resonance
Ans. Refer to Chapter-5, Q.No.-7 CLICK
(e) Give chemical equations for the following:
(i) Aldol condensation
Ans. Refer to Chapter-14, Q.No.-9 CLICK
(ii) Sandmeyer reaction
Ans. Refer to Chapter-9, Q.No.-11 CLICK
(iii) Perkin reaction
Ans. Refer to Chapter-14, Q.No.-8 CLICK
(iv) Beckmann rearrangement
Ans. Refer to Chapter-17, Q.No.-19 CLICK
(f) Give the preparation and uses of the following:
(i) Iodoform
Ans. Refer to Chapter-14, Q.No.-9 CLICK
(ii) Salicylic acid
Ans. For Full Answer CLICK
(g) Explain the following and give their uses:
(i) Hell-Volhard-Zelinsky reaction
Ans. Refer to Chapter-15, Q.No.-8 CLICK
(ii) Crown ethers
Ans. Refer to Chapter-13, Q.No.-1
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