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Set 8 of 25 · Questions 211-240 of 724

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JEE Main Chemistry · General Organic Chemistry · Set 8 (Q211-240)

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  1. 211.
    The IUPAC name of the compound is
    1. (1)pent‐4‐yn‐2‐ene
    2. (2)pent‐3‐en‐l‐yne
    3. (3)pent‐2‐en‐4‐yne
    4. (4)pent‐l‐yn‐3‐ene
  2. 212.
    Compound from the following that will not produce precipitate on reaction with is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  3. 213.
    The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is:
    1. (1)The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain.
    2. (2)The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain.
    3. (3)The eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain.
    4. (4)The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain.
  4. 214.
    Which one of the carbocations from the following is most stable?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  5. 215.
    In Dumas method for the estimation of , the sample is heated with copper oxide and the gas evolved is passed over :
    1. (1)Ni
    2. (2)Copper gauze
    3. (3)Pd
    4. (4)Copper oxide
  6. 216.
    A pair of compounds which shows geometelat isomerism is
    1. (1)ethanol and acetone
    2. (2)n-butane and isobutene
    3. (3)dimethyl ether and ethanol
    4. (4)maleic acid and fumaric acid.
  7. 217.
    Amongst the following the most basic compound is
    1. (1)p-Nitroaniline
    2. (2)Acetanilide
    3. (3)Aniline
    4. (4)Benzylamine
  8. 218.
    The most suitable method of separation of 1 : 1 mixture of ortho and
    para‐nitrophenols is
    1. (1)chromatography
    2. (2)crystallisation
    3. (3)steam distillation
    4. (4)sublimation.
  9. 219.
    CH3Br + Nu– CH3 – Nu + Br–
    The decreasing order of the rate of the above reaction with nucleophiles (Nu¯) A to D is :
    1. (1)D > C > B > A
    2. (2)A > B > C > D
    3. (3)B > D > C > A
    4. (4)D > C > A > B
  10. 220.
    Relative stability of the contributing structures is :
    1. (1)(I) (II) (III)
    2. (2)(I) (III) (II)
    3. (3)(II) (I) (III)
    4. (4)(III) (II) (I)
  11. 221.
    Among the following compounds the one that is most reactive towards
    electrophilic nitration is
    1. (1)benzoic acid
    2. (2)nitrobenzene
    3. (3)toluene
    4. (4)benzene
  12. 222.
    Consider the reaction :
    CH3CH2CH2Br + NaCN CH3CH2CH2CN + NaBr
    This reaction will be the fastest in :
    1. (1)water
    2. (2)ethanol
    3. (3)methanol
    4. (4)N,N’-dimethylformamide (DMF)
  13. 223.
    Which of the following is metamer of the given compound ?
    1. (1) (N-cyclohexylbenzamide)
    2. (2) (N-phenylbenzamide)
    3. (3) (N-cyclohexylcyclohexanecarboxamide)
    4. (4)
  14. 224.
    In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of :
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  15. 225.
    Reaction of one molecule of HBr with one molecule of 1, 3-butadiene at 40°C gives predominantly
    1. (1)3-bromobutene under kinetically controlled conditions
    2. (2)1-bromo-2-butene under thermodynamically controlled conditions
    3. (3)3-bromobutene under thermodynamically controlled conditions.
    4. (4)1-bromo-2-butene under kinetically controlled conditions.
  16. 226.
    Which one of the nitrogen atoms in is the most nucleophilic?
    1. (1)III
    2. (2)I
    3. (3)II
    4. (4)All three nitrogen atoms are equally strong nucleophilic centers.
  17. 227.
    Match List I with List II

    Choose the correct answer from the options given below :
    1. (1)(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
    2. (2)(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
    3. (3)(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
    4. (4)(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  18. 228.
    Maximum dehydration takes place that of :
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  19. 229.
    The major product formed in the following reaction is :
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  20. 230.
    The IUPAC name of the following compound is :
    1. (1)4-Bromo-3-cyanophenol
    2. (2)2-Bromo-5-hydroxybenzonitrile
    3. (3)2-Cyano-4-hydroxybromobenzene
    4. (4)6-Bromo-3-hydroxybenzonitrile
  21. 231.
    In the following skew conformation of ethane, dihedral angle is:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  22. 232.
    The number of chiral alcohol(s) with molecular formula O is______.
  23. 233.
    The transformation occurring in Duma's method is given below :

    The value of y is ____. (Integer answer)
  24. 234.
    The number of hyperconjugation structures involved to stabilize carbocation formed in the above reaction is__________.
  25. 235.
    Using the given figure, the ratio of values of sample and sample is . Value of is_______

    Fig : Paper chromatography of Samples
  26. 236.
    Following chromatograrn was developed by adsorption of compound 'A' on a 6 cm TLC glass plate. Retardation factor of the compound 'A' is ______x .
  27. 237.
    Three organic compounds A, B and C were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The value of the most polar compound is_____x
  28. 238.
    The number of moles of CuO, that will be utilized in Dumas method for estimation nitrogen in a sample of 57.5 g of N, N-dimethylaminopentane is ____ ×. (Nearest integer)
  29. 239.
    In the sulphur estimation, 0.471 g of an organic compound gave 1.44 g of barium sulphate. The percentage ofsulphur in the compound is ____ %.
    (Nearest integer) (Atomic Mass of Ba = 137u)
  30. 240.
    In the given TLC, the distance of spot are , from the bottom of TLC plate, respectively. value of is times more than . The value of is______