JEE Questions for Chemistry Organic Chemistry Some Basic Principles And Techniques Quiz 5 - MCQExams.com

The cylindrical shape of alkynes is due to
  • three sigma C— C bonds
  • three π C— C bonds
  • two σ C — C and one π C — C bonds
  • one sigma C— C and two π C— C bonds
Which of the following species would be expected to exhibit aromatic character? Select the correct answer from the following:
Chemistry-Organic Chemistry Some Basic Principles and Techniques-6009.png
  • I and IV
  • II and IV
  • I and III
  • II and III
The chemical system that is non aromatic is ?

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6010.png
  • 2)
    Chemistry-Organic Chemistry Some Basic Principles and Techniques-6011.png

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6012.png

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6013.png
Polarization of electrons in acrolein may be written as

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6015.png
  • 2)
    Chemistry-Organic Chemistry Some Basic Principles and Techniques-6016.png

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6017.png

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6018.png

Chemistry-Organic Chemistry Some Basic Principles and Techniques-6020.png
  • RCONHBr and RNCO
  • RNHCOBr and RNCO
  • RNH- Br and RCONHBr
  • RCONBr2
Acetaldehyde is the rearrangement product of
  • Methyl alcohol
  • Allyl alcohol
  • Vinyl alcohol
  • All are correct
The arrangement of (CH3)3 C –, (CH2)2 CH–, CH3CH2 – when attached to benzene or an unsaturated group in increasing order of inductive effect is
  • (CH3)3 C - < (CH3)2 CH - < CH3 CH2 -
  • CH3 CH2 - < (CH3)2 CH - < (Ch3)3 C -
  • (CH3)2 CH - < (CH3)3 C - < CH(3)3 C - < CH3 CH2 C -
  • (CH3)3 C - < CH3 Ch2 < (CH3)2 CH -
Which of the following compounds possesses the C-H bond with the lowest bond dissociation energy?
  • Toluene
  • Benzene
  • n-Pentane
  • 2,2-Dimethylpropane
The most suitable method for separation of a 1:1 mixture of ortho and para-nitrophenols is
  • Sublimation
  • Chromatography
  • Crystallization
  • Steam distillation
Dumas method involves the determination of nitrogen content in the organic compound in form of
  • NH3
  • N2
  • NaCN
  • (NH4)2SO4
A compound with empirical formula CH2O has a vapour density of 30. Its molecular formula is
  • C2H2O2
  • C2H4O2
  • C3H6O3
  • C6H12O6
Beilstein’s test is answered by
  • Halogens
  • Pyridine
  • Thiourea
  • All the above
The number of structural and configurational isomers of a bromo compound, C5H9Br, formed by the addition of HBr to 2-pentyne respectively are
  • 1 and 2
  • 2 and 4
  • 4 and 2
  • 2 and 1
How many chiral carbon atoms are present in 2,3,4-trichloropentane ?
  • Three
  • Two
  • One
  • Four
One recently discovered allotrope of carbon (e.g.C60) is commonly known as
  • Flourine
  • Fullerene
  • Flourene
  • Freon
The process of separation of a racemic modification into-d-and lenantiomers is called
  • Resolution
  • Dehydration
  • Revolution
  • Dehydrohalogenation
The most stable conformation of ethylene glycol is
  • Anti
  • Gauche
  • Partially eclipsed
  • Fully eclipsed
The correct statement about the compounds A,B,C
Chemistry-Organic Chemistry Some Basic Principles and Techniques-6026.png
  • A and B are identical
  • A and B are diastereomers
  • A and C are enantiomers
  • A and B are enantiomers
Which of the following compounds will exhibit geometrical isomerism?
  • 1-Phenyl-2-butene
  • 3-Phenyl-1-butene
  • 2-Phenyl-1-butene
  • 1,1-Diphenyl-1-propene
Which of the following is a technique of purification of organic compound ?
  • Oxidation
  • Reduction
  • Distillation
  • Hydrolysis
Which of the following is/are method (s) of checking the purity of organic compound ?
  • Chromatography
  • Spectroscopy
  • Both (and (2)
  • Neither (nor (2)
What is called the purification technique based on difference in the solubility of the compound and the impurities in a given solvent ?
  • Sublimation
  • Crystallization
  • Distillation
  • Fractional distillation
A compound contains C = 90% and H = 10 %. Find empirical formula of the compound.
  • C3H10
  • CH2
  • C3H2
  • C3H4
Empirical formula of a compound is CH2O and its vapour density is 30. What is the molecular formula of compound ?
  • C3H6O3
  • C2H4O2
  • C2H4O
  • CH2O
An organic compound contains C = 36%, H = 6%. What is the empirical formula of compound ?
  • C3H6
  • CH6
  • CH2O
  • C2H2O2
Which method of purification of organic compound is useful to separate volatile liquids from non volatile impurities ?
  • Sublimation
  • Distillation
  • Crystallisation
  • Fractional crystallisation
Which method of purification of organic compound is useful to separate liquids having sufficient difference in their boiling point ?
  • Sublimation
  • Distillation
  • Filtration
  • Crystallisation
Which of the following method can be employed to separate a mixture of Chloroform (b.p 334 k) and aniline (b.p 457 k) ?
  • Distillation
  • Crystallisation
  • Sublimation
  • All of these
Insulin contains 3.4% Sulphur. The minimum molecular weight of insulin is
  • 350
  • 470
  • 560
  • 940
Which element is estimated by Caribs method ?
  • Nitrogen
  • Carbon
  • Hydrogen
  • Halogen
Which of the following techniques is used to separate glycerol from spent-lye in soap industry ?
  • Simple distillation
  • Fractional distillation
  • Distillation under reduced pressure
  • None of these
Which method is used to separate aniline water mixture ?
  • steam distillation
  • distillation under reduced pressure
  • sublimation
  • None of these
Chromatography is used
  • to separate mixtures
  • to purify compounds
  • to test the purity of compounds
  • All of these
In chromatography Rf means
  • Retardation factor
  • Reduced formula
  • Reduction factor
  • Retardation frequency
In Chromatography, ninhydrin solution is used to detect
  • amino acids
  • ethers
  • hydrocarbons
  • glucose
In a method of detecting C and H, organic compound is heated with ...
  • CuO
  • Ca(OH)2
  • CuSO4
  • All of these
In a detection of C and H, the water produced is tested by
  • CuO
  • Ca(OH)2
  • CuSO4
  • All of these
Lassaigne test is used for detection of
  • N
  • S
  • P
  • All of these
In the Lassaigne test of detection of Sulphur, black precipitates are obtained. These are due to the formation of
  • Na2S
  • (CH3COO)2Pb
  • PbS
  • CH3COOH
What colour is observed when Lassaigne solution of Sulphur containing compound is treated with Sodium Nitroprusside ?
  • Red
  • Violet
  • Blue
  • Brown
During the estimation of C and H, the CO2 produced id absorbed in
  • KOH
  • An.CaCl2
  • CuO
  • O2
During the estimation of C and H, the H2O produced id absorbed in
  • KOH
  • An.CaCl2
  • CuO
  • O2
An organic compound gave the following results on analysis. C = 53.3%, H = 15.6%, N = 31.1%. Find molecular formula of compound. (Molecular Weight = 45)
  • C2H5N2
  • C2H7N
  • C2H5N
  • C2H6N
An organic compound contains C, H and O in the proportion of 6 : 1 : 8 by weight, respectively. Find its molecular formula (V.D = 30)
  • CH2O
  • C3HO
  • C2H4O2
  • CH4O
0.2595 gm of organic substance gave 0.35 gm BaSO4 . Find % S in the substance.
  • 18.5
  • 182
  • 17.5
  • 175
Which of the following is the method of estimating nitrogen in organic Compound ?
  • Dumas method
  • Kjeldahlis method
  • Both (& (2)
  • Neither(nor (2)
In the Dumas method nitrogen containing organic compound is first heated with
  • O2
  • CuO
  • CO2
  • CuO and CO2
In Dumas method the gaseous mixture produced is passed through KOH(aq) . As a result of this _______ is absorbed in KOH(aq)
  • CO2
  • O2
  • NOx
  • All of these
In Dumas method the formula of % N is

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6030.png
  • 2)
    Chemistry-Organic Chemistry Some Basic Principles and Techniques-6031.png

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6032.png

  • Chemistry-Organic Chemistry Some Basic Principles and Techniques-6033.png
In Dumas method for estimation of nitrogen, 0.3 g of an organic compound gave 50 ml of nitrogen collected at 300 K temperature and 715 mm pressure. Calculate the % of N in the compound. ( Aqueous tension at 300 K = 15 mm)
  • 20.8 %
  • 17.46 %
  • 34.5%
  • 25 %
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