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Question Bank No: 1

1. Complete combustion of 0.858 g of compound X gives 2.577 g of ${CO}_{2}$ and 1.398 g of $H_{2} O .$ The lowest molecular mass that X can have is

a)		44
b)		22
c)		129
d)		172

2. Haemoglobin contains 0.33% of iron by mass. The molecular mass of haemoglobin is approximately 67200. The number of iron atoms [at mass Fe =56] present is one molecule of haemoglobin is

a)		6
b)		1
c)		4
d)		2

3. The molecular mass of an organic compound which contains only one nitrogen atom can be

a)		73
b)		76
c)		146
d)		152

4. The chloroplatinate of an organic base contains 39% of Pt. The equivalent mass of the base is

a)		73
b)		59
c)		65
d)		45

5. 0.28 g of a nitrogens compound was kjeldahised to produce 0.17 g of NH3. The percentage of nitrogen in the organic compound is

a)		5
b)		25
c)		50
d)		40

6. The percentage composition of a compound is C = 90% and H = 10%. A plausible formula of the compound is

a)		$C_{8} H_{10}$
b)		$C_{15} H_{30}$
c)		$C_{15} H_{20}$
d)		$C_{15} H_{12}$

7. A hydrocarbon has C =85.72% and remaining H. The hydrocarbon is

a)		$C_{2} H_{4}$
b)		$C_{2} H_{6}$
c)		$C_{2} H_{2}$
d)		C $H_{4}$

8. A is a lighter phenol and B is an aromatic carboxylic acid. Separation of a mixture of A and B can be carried out easily by using a solution of

a)		Sodium hydroxide
b)		Sodium sulphate
c)		Calcium chloride
d)		Sodium bicarbonate

9. 32 g of an organic compound contains 12 g hydrogen and rest oxygen. Its simple formuls is

a)		C $H_{2} O$
b)		$C_{2} H_{4} O_{2}$
c)		${CH}_{4} O$
d)		$C_{2} H_{8} O_{2}$

10. Kjeldahl's method cannot be used for estimation of nitrogen in

a)		Pyridine
b)		Nitro compound
c)		Azo compounds
d)		All the above

11. A compound which does not given a positive test in the Lassaigne's test for nitrogen is

a)		Urea
b)		Hydroxyl amine
c)		Glycine
d)		Phenylhydrazine

12. A mixture of acetone and methanol can be separated by

a)		Vacuum distillation
b)		Steam distillution
c)		Fractional distillation
d)		Simple distillution

13. By decreasing the pressure, the boiling point of a liquid

a)		Increases
b)		Decreases
c)		remains constant
d)		may increase or decrease

14. Sugar containing an impurity of common salt can be purified by crystallization from

a)		Benzene
b)		Ethanol
c)		Petroleum ether
d)		Water

15. The technique of gas chromatography is suitable for compounds which

a)		Are liquids
b)		have very low boiling points
c)		are soluble in water
d)		vapourize without decomposition

16. Steam distillation is used for the extraction of

a)		Essential oils
b)		Higher alkynes
c)		Mineral oils
d)		Fatty acids

17. Which of the following is a most suitable method for the separation of 1:1 mixture of ortho and paraphenols?

a)		Crystallisation
b)		Sublimation
c)		Steam distillation
d)		Separating funnel

18. Which of the following pair contains species having same percentage of carbon?

a)		Benzene, Acetylene
b)		Benzene,Toluene
c)		Ethanal, Ethanol
d)		Anisole, Phenetole

19. Which of the following process is suitable for the purification of aniline?

a)		simple distillation
b)		fractional distillation
c)		fractional crystalization
d)		steam distillation

20. The number of isomers for the compound with the molecular formula $C_{2} BrClFi$ is

a)		3
b)		4
c)		5
d)		6

21. An organic compound weight 0.31g gave 0.444 g of magnesium pyrophosphate in the estimation of phosphorous by Carius method.The % of P in the compound is

a)		20
b)		60
c)		30
d)		40

22. For the purification, isolation and separation of organic compounds, the latest techniques followed is

a)		Chromatography
b)		Steam distillation
c)		Fractional crystallization
d)		Sublimation

23. 5.6 g of an organic compound on burning with excess of oxygen gave 17.6 g of ${CO}_{2}$ and 7.2g of $H_{2} O .$ The organic compound is

a)		$C_{6} H_{6}$
b)		$C_{4} H_{8}$
c)		$C_{3} H_{8}$
d)		${CH}_{3} COOH$

24. The strongest ortho-para and strongest meta - directing groups respectively are

a)		- ${NO}_{2}$ and - ${NH}_{2}$
b)		- ${NH}_{2}$ and - ${CONH}_{2}$
c)		-X and - ${CONH}_{2}$
d)		- ${NH}_{2}$ and - ${NO}_{2}$

25. Consider the following compounds
organicchemistry-purifi-q16
IUPAC name of this compound is

a)		5,6-Diethyl 1-3-methyl decane
b)		5,6-Diethyl-3-methyl dec-4-ene
c)		3,5,6-Trimethyl-dec-6-ene
d)		3,5,6-Trimethyl-dec-4-ene

26. 0.59 g of the silver salt of an organic acid (molar mass 210) on ignition gave 0.36 g of pure silver.The basisity of the acid is

a)		3
b)		2
c)		1
d)		4

27. Which of the following is not aromatic?

a)		Benzene
b)		Cyclopropenyl cation
c)		Cyclopentadienyl cation
d)		Cyclopentadienyl anion

28. Which of the following will show geometrical isomerism

a)		2-Methyl butane
b)		Propene
c)		But-2-ene
d)		2-Methyl propene

29. How much of sulphur is present in an organic compound,if 0.53 g of the compound gave 1.158 g of ${BaSO}_{4}$ on analysis?

a)		10%
b)		15%
c)		20%
d)		30%

30. 0.4 g of a silver salt of a monobasic organic acid gave 0.26 g pure silver on ignition. The molecular weight of the acid is ......(Atomic weight of silver =108)

a)		58
b)		72
c)		90
d)		104

31. Match list 1 with list 11 and select the correct answer using the code given below lists
$\begin{matrix} List 1 (Mixture) & List 11 (Method for separation) \\ 1. 0 - and p - Nitrophenols & a . Azeotropic \\ 2. Naphthalene and urea & b . Steam distillation \\ 3. Heptane and octane & c . Simple distillation \\ 4. Benzene and nitrobenzene & d . Sublimation \\ e . Gas chromatography \end{matrix}$

a)		1-a,2-d,3-e,4-c
b)		1-b,2-d,3-c,4-e
c)		1-b,2-d,3-e,4-c
d)		1-c,2-e,3-d,4-a

32. The silver salt of an unknown monoacidic alkyne contains 67.08% silver. The structure of the alkyne is

a)		$H_{3} C - {CH}_{2} - C \equiv CH$
b)		$H_{3} C - C \equiv CH$
c)		H $C \equiv CH$
d)		$H_{3} C - C \equiv C - C H_{3}$

33. In Lassaiogne's test, a blue colour is obtained if the organic compound contains nitrogen.The blue colour is due to

a)		$K_{4} [{Fe (CN)}_{6}]$
b)		${Fe}_{4} [{Fe (CN)}_{6}]_{3}$
c)		${Na}_{3} [{Fe (CN)}_{6}]$
d)		Cu $[{Fe (CN)}_{6}]$

34. A compound has an empirical formula $C_{2} H_{4} O .$ An independent analysis gave a value of 132.16 for its molecular mass.What is the correct molecular formula?

a)		$C_{4} H_{4} O_{5}$
b)		$C_{10} H_{12}$
c)		$C_{7} O_{3}$
d)		$C_{6} H_{12} O_{3}$

35. An organic compound contains 49.3% carbon 6.84% hydrogen and its vapour density is 73. Molecular formula of the compound is

a)		$C_{3} H_{6} O_{2}$
b)		$C_{3} H_{10} O_{2}$
c)		$C_{6} H_{9} O$
d)		$C_{6} H_{10} O_{4}$

36. Which of the following statement is wrong?

a)		Using Lassaigne's test nitrogen and sulphur present in organic compound can be tested
b)		In Lassaigne's filtrate the nitrogen present in a organic compound is converted into NaCN
c)		Lassaigne's test fail to identify nitrogen in diazo compound
d)		In the estimation of Carbon, an organic compound is heated with CaO in a combustion tube

37. The number of isomeric hexanes is

a)		5
b)		3
c)		4
d)		6

38. The ester among the following is

a)		Calcium lactate
b)		Ammonium acetate
c)		Calcium formate
d)		Methyl butyrate

39. Which of the following statement is wrong?

a)		Diethyl ketone and methyl propyl ketone are position isomers
b)		2-Chloropenlane and 1-Chloropenlane are position isomers
c)		n-Butane and 2-Methyl propane are chain isomers
d)		Acetone and propinaldehyde are functional isomers

40. The empirical formula of a compound ${CH}_{2} O$ and its molecular weight is 120. The molecular formula of the compound is

a)		$C_{2} H_{4} O_{2}$
b)		$C_{3} H_{6} O_{3}$
c)		$C_{4} H_{8} O_{4}$
d)		${CH}_{2} O$

41. In a compound C, H and N are present in 9:1:3.5 by weight. If molecular weight of the compound is 108, the molecular formula of compound is

a)		$C_{2} H_{6} N_{2}$
b)		$C_{3} H_{4} N$
c)		$C_{6} H_{8} N_{2}$
d)		$C_{9} H_{12} N_{3}$

42. 0.765g of an acid gives 0.535g of ${CO}_{2}$ and 0.138 g of $H_{2} O .$ Then the ratio of the percentage of carbon and hydrogen is

a)		19 : 2
b)		18 : 11
c)		70 : 17
d)		1 : 7

43. In paper chromatography,

a)		Moving Phase is liquid and stationary phase is solid
b)		Moving Phase is liquid and stationary phase is liquid
c)		Moving Phase is solid and stationary phase is solid
d)		Moving Phase is solid and stationary phase is liquid

44. The empirical formula of an acid is ${CH}_{2} O_{2},$ the probable molecular formula of the simplest acid may be

a)		${CH}_{2} O$
b)		${CH}_{2} O_{2}$
c)		${C_{2} H}_{4} O_{2}$
d)		${C_{3} H}_{6} O_{4}$

45. 0.1914 g of an organic acid is dissolved in about 20 ml of water 25 ml of 0.12 N NaOH is required for the complete neutralization of the acid solution. The equivalent weight of the acid is

a)		65.0
b)		64.0
c)		63.8
d)		62.5

46. Empirical formula of a compound is ${CH}_{2} O .$ If its vapour density is 90, then the molecular formula of the compound is

a)		$C_{5} H_{10} O_{5}$
b)		$C_{3} H_{6} O_{3}$
c)		$C_{6} H_{12} O_{6}$
d)		$C_{4} H_{8} O_{4}$

47. A mixture contains four solid organic compounds A,B,C and D. On heating only C changes from solid to vapour state.C can be separated from the rest in the mixture by

a)		distillation
b)		sublimation
c)		fractional distillation
d)		crystallisation

48. If 0.2g of an organic compound containing carbon, hydrogen and oxygen on combustion yielded 0.147g ${CO}_{2}$ and 0.12g water. What will be the content of oxygen in substance?

a)		73.29%
b)		78.45%
c)		83.23%
d)		89.50%

49. The best method to separate the mixture of ortho and para nitrophenol(1:1) is

a)		Steam distillation
b)		crystallization
c)		vaporisation
d)		colour spectrum

50. If on adding FeC $l_{3}$ solution to acidified Lassaigne solution, a blood red colouration is produced, it indicates the presence of

a)		S
b)		N
c)		N and S
d)		S and Cl