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Set 5 of 25 · Questions 121-150 of 724

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JEE Main Chemistry · General Organic Chemistry · Set 5 (Q121-150)

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  1. 121.
    Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
    Assertion A : Benzene is more stable than hypothetical cyclohcxatriene.
    Reason R : The delocalized electron cloud is attracted more strongly by nuclei of carbon atoms.
    choose the correct answer from the options given below:
    1. (1)A is true but R is false.
    2. (2)A is false but R is true.
    3. (3)Both A and R are correct and R is the correct explanation of A.
    4. (4)Both A and R are correct but R is NOT the correct explanation of A.
  2. 122.
    The increasing order of nucleophilicity of the following nucleophiles is :
    (A) (B)
    (C) (D)
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  3. 123.
    Given below are two statement :
    Statement I : o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding
    Statement II : 0-Nitrophenol has high melting point due to hydrogen bonding.
    choose the most appropriate answer from the options given below :
    1. (1)Both Statement I and Statement II are false
    2. (2)Statement I is false but Statement II is true
    3. (3)Both Statement I and Statement II are true
    4. (4)Statement I is true but Statement II is false
  4. 124.
    An 2 reaction at an asymmetric carbon of a compound always gives :
    1. (1)an enantiomer of the substrate
    2. (2)a product with opposite optical rotation
    3. (3)a mixture of diastereomers
    4. (4)a single stereoisomer
  5. 125.
    Which of the following will most readily give the dehydrohalogenation product ?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  6. 126.
    Identify the correct statements from the following
    (i) Electromeric effect is a permanent effect.
    (ii) Hyper conjugation is a temporary effect.
    (iii) Fractional distillation is used to separate two liquids from a mixture if the difference in their boiling points is less.
    (iv) Different compounds are adsorbed on an adsorbent different extents.
    1. (1)ii, iii, iv
    2. (2)i, ii, iii
    3. (3)ii, iv
    4. (4)iii, iv
  7. 127.
    The correct increasing order of the reactivity of halides for SN1 reaction is :
    1. (1)CH3 – CH2 – X  <  (CH3)2CH – X  <  CH2 == CH – CH2 – X  <  PhCH2 – X
    2. (2)(CH3)2CH – X    <  CH3 – CH2 – X <  CH2 == CH – CH2X  <  PhCH2 – X
    3. (3)PhCH2 – X       <  (CH3)2CH – X  <   CH3 – CH2 – X  <   CH2 == CH – CH2 – X
    4. (4)CH2=CH–CH2–X  <  Ph – CH2 – X  <  (CH3)2CH – X  <  CH3 – CH2 – X
  8. 128.
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
    Assertion A: A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene.
    Reason R: Benzoic acid is soluble in hot water.
    choose the most appropriate answer from the options given below.
    1. (1)Both A and R are true and R is the correct explanation of A.
    2. (2)Both A and R are true but R is NOT the correct explanation of A.
    3. (3)A is true but R is false.
    4. (4)A is false but R is true.
  9. 129.
    The technique used for purification of steam volatile water immiscible substance is:
    1. (1)Fractional distillation
    2. (2)Fractional distillation under reduced pressure
    3. (3)Distillation
    4. (4)Steam distillation
  10. 130.
    Match List-I with List-II
    1. (1)(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
    2. (2)(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
    3. (3)(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
    4. (4)(A)-(III), (B)-(IV), (C)- (D)-(II)
  11. 131.
    Which of the following does not show geometrical isomerism ?
    1. (1)1,2-Dichloro-1-pentene
    2. (2)1,3-Dichloro-2-pentene
    3. (3)1,1-Dichloro-1-pentene
    4. (4)1,4-Dichloro-2-pentene
  12. 132.
    The correct decreasing order for acid strength is:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  13. 133.
    The potassium ferrocyanide solution gives a Prussian blue colour, when added to :
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  14. 134.
    Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  15. 135.
    Mesomeric effect involves delocalisation of
    1. (1)protons
    2. (2)pi electrons
    3. (3)sigma electrons
    4. (4)none of these.
  16. 136.
    Metamerism can be exhibited by the compounds containing
    1. (1)monovalent functional group
    2. (2)bivalent functional group
    3. (3)double bond
    4. (4)triple bond
  17. 137.
    The delocalization of electrons of bond of an alkyl group with the electrons of benzene is observed in
    1. (1)Inductive effect
    2. (2)Hyperconjugation effect
    3. (3)Resonance effect
    4. (4)Electromeric effect
  18. 138.
    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-IV, C-III, D-II
    4. (4)A-III, B-I, C-IV, D-II
  19. 139.
    Given below are two statements :
    Statement I : Aniline is less basic than acetamide.
    Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton.
    Choose the most appropriate option ;
    1. (1)Statement I is true but statement II is false.
    2. (2)Statement I is false but statement II is true.
    3. (3)Both statement I and statement II are true.
    4. (4)Both statement I and statement II are false.
  20. 140.
    Which of the following statements is not correct?
    1. (1)Double bond is shorter than a single bond.
    2. (2)Sigma bond is weaker than a (pi) bond.
    3. (3)Double bond is stronger than a single bond.
    4. (4)Covalent bond is stronger than hydrogen bond.
  21. 141.
    Methods used for purification of organic compounds are based on :
    1. (1)nature of compound and presence of impurity.
    2. (2)neither on nature of compound nor on the impurity present.
    3. (3)nature of compound only.
    4. (4)presence of impurity only.
  22. 142.
    Which one is a nucleophilic substitution reaction among the following?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  23. 143.
    The decreasing order of priority for the following functional groups in the IUPAC Nomenclature is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  24. 144.
    Which one of the following conformations of cyclohexane is chiral?
    1. (1)Chair
    2. (2)Boat
    3. (3)Twist boat
    4. (4)Rigid
  25. 145.
    A pair of compounds having the same boiling points are
    1. (1)cis but-2-ene and trans but-2-ene
    2. (2)n-hexane and neo-hexane
    3. (3)benzene and naphthalene
    4. (4)(+) butan-2-ol and (-) butan-2-ol.
  26. 146.
    Which one of the following orders is correct regarding the —I effect of the
    substituents?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  27. 147.
    Which of the following compounds does not exhibit resonance?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  28. 148.
    Optical activity of an enantiomeric mixture is +12.6° and the specific rotation of (+) isomer is +30°. The optical purity is____%
  29. 149.
    In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl . The percentage composition of chlorine in the compound is . (Given: molar mass in of )
  30. 150.
    In sulphur estimation. 0.471 g of an organic compound gave 1.4439 g of barium sulphate.The percentage of sulphur in the compound is_____________(Nearest Integer)(Given: Atomic mass Ba: 137 u: S: 32 u, O: 16 u )