40 ORGANIC CHEMISTRY QUESTION 100 LEVEL STUDENTS SHOULD STUDY

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1.       How many peaks would you expect for each of the three signals in the high resolution proton NMR of CH₃CH₂CH₂Br.

2.       Which of the following statements is incorrect? (a) A pure organic compound has a definite melting point. (b) UV-VIS spectroscopy cannot be used to ascertain the purity of an organic compound. (c) Molecular  vibration is associated with infra-red spectroscopy (d) ¹³C NMR involves use of large samples.

3.       Kjeldahl’s method is associated with determination of what element?

4.       What is the percentage composition of C and H in the following compound?

5.       Na + C + N NaCN. This reaction is characteristics of (a) sodium amalgam test (b) Dumas method of protein determination (c) Carius method (d) none of the above.

6.       What are diastereomers?

7.       n-butyl chloride and t-butyl chloride are ___ isomers

8.       what is the percentage composition of elements in the compound C₁₈H₁₆O₇

9.       1g of compound X containing C, H and O gave 2.442g of CO2 and 1.00g of H2O. if the 

molecular weight of the compound is 72, calculate the molecular formular.

10.   Ethanol and ethanal may be classified as ___ isomers

11.   The unit used in IR-spectroscopy is?

12.   Give two examples of detectors used in GC.

13.   What is base peak in MS?

14.   What is the formula of sodium nitroprusside?

15.   Unit of UV is _________

16.   Which spectroscopic tool absorbs from 190nm-400nm?

17.   Which spectroscopic tool absorb from 400nm-800nm?

18.   In paper chromatography, the R_F of a compound was 0.8. If the distance moved by the solvent font was 9mm, what distance was covered by the organic compound?

19.   In gas chromatography procedure, the resolution of a mixture into its components is governed by (a) solubility (b) polarity (c) dipole moment (d) volatility

20.   Which of the following is not true about the solvent of choice for recrystallization? (a) it should give well formed crystals (b) it should be fairly volatile (c) it should not react with the compound of interest (d) the impurities should be fairly soluble.

21.   Which of the following is not  part of a distillation set up? (a) condenser (b) thimble (c) retort stand (d) round bottomed flask.

22.   The sample container in IR spectrophotometer is made of what?

23.   Which of the following inference gives a confirmatory test of purity of an organic compound? (a) sharp melting point (b) characteristic smell (c) one peak in gas chromatography (d) A bright colour.

24.   The structure of acetophenone is _______________

25.   The common name for (CH₃)₄C is ________________

26.   The shape of ethane molecule is _________________

27.   The bond angle in ethyne is _____________________

28.   What is the exact number of molecules of oxygen required to combust 2,2-dimethyl butane to CO₂ and H₂O?

29.   Wurtz reaction is the reaction of _________________

30.   Give the general formula for Grignard reagent.

31.   What is lucas reagent?

32.   Why is the reaction between tertiary aliphatic amine and nitrous acid not possible?

33.   What is electrophile and nucleophile?

34.   How can reversibility be removed in esterification reaction?

35.   The decarboxylation of caborxylic acid will produce _________ and ___________

36.   The functional group present in an organic compound which gives bubbles on treatment with a saturated solution of NaHCO₃ is ________

37.   Addition of an aqueous solution of barium chloride to the aqueous solution of a salt gives a white precipitate. The salt is likely to be a ______________

38.   Catalytic hydrogenation of benzene produces _____________

39.   The synthetic rubber obtained by the polymerization of chlorobutadiene in the presence of sodium is called ________________

40.   Terylene is synthesized from _____________ and _______________

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