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NEET Chemistry · General Organic Chemistry · Set 2 (Q31-60)

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  1. 31.
    The correct order of the relative stability of the following carbanions is
    I.
    II.
    III.
    IV.
    1. (1)I IV II III
    2. (2)III IV I II
    3. (3)IV II I III
    4. (4)IV I II III
  2. 32.
    Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R
    Assertion A : Thin layer chromatography is an adsorption chromatography.
    Reason : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent.
    choose the correct 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
  3. 33.
    The number of sigma (σ) and pi(π) bonds in pent-2-en-4-yne is :
    1. (1)13 σ bonds and no π bond
    2. (2)10 σ bonds and 3 π bond
    3. (3)8 σ bonds and 5 π bond
    4. (4)11 σ bonds and 2 π bond
  4. 34.
    The general formula CnH2nO2 could be for open chain
    1. (1)diketones
    2. (2)carboxylic acids
    3. (3)diols
    4. (4)dialdehydes.
  5. 35.
    Which one of the following methods can be used to find out the percentage composition of halogen present in an organic compound?
    1. (1)Kjeldahl method
    2. (2)Duma's method
    3. (3)Lassaigne's method
    4. (4)Carius method
  6. 36.
    Which of the following compounds undergoes nucleophilic substitution
    reaction most easily?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  7. 37.
    The correct order of acid strength of compounds
    CH≡CH, –C≡CH and = is as follows :
    1. (1)CH3–C≡CH > CH≡CH > CH2=CH2
    2. (2)CH3–C≡CH > CH2 =CH2 > HC≡CH
    3. (3)HC≡CH > CH3 –C≡CH > CH2 = CH2
    4. (4)CH ≡CH > CH2 =CH2 > CH3–C≡CH
  8. 38.
    Which of the following carbocations is expected to be most stable?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  9. 39.
    In the following structures, which one is having staggered conformation with maximum dihedral angle?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  10. 40.
    From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous , is
    1. (1)2-Butanol
    2. (2)2-Methylpropan-2-ol
    3. (3)2-Methylpropanol
    4. (4)1-Butanol
  11. 41.
    The correct match between Item I and Item II is:
    Item I Item II
    (A) Benzaldehyde (P) Mobile phase
    (B) Alumina (Q) Adsorbent
    (C) Acetonitrile (R) Adsorbate
    1. (1)(A) → (Q); (B) → (P); (C) → (R)
    2. (2)(A) → (R); (B) → (Q); (C) → (P)
    3. (3)(A) → (Q); (B) → (R); (C) → (P)
    4. (4)(A) → (P); (B) → (R); (C) → (Q)
  12. 42.
    With respect to the conformers of ethane, which of the following statements is true?
    1. (1)Bond angle remains same but bond length changes
    2. (2)Bond angle changes but bond length remains same
    3. (3)Both bond angle and bond length changes
    4. (4)Both bond angles and bond length remains same
  13. 43.
    In steam distillation of toluene, the pressure of toluene in vapour is
    1. (1)equal to pressure of barometer
    2. (2)less than pressure of barometer
    3. (3)equal to vapour pressure of toluene in simple distillation
    4. (4)more than vapour pressure of toluene in simple distillation.
  14. 44.
    of organic compound on Kjeldahlization liberates ammonia which consumes of . The percentage of nitrogen in the organic compound is
    1. (1)30
    2. (2)35
    3. (3)46.67
    4. (4)20.8
  15. 45.
    Which one is the correct order of acidity ?
    1. (1)CH2=CH2 > CH3–CH=CH2 > CH3–C≡CH > CH≡CH
    2. (2)CH≡CH > CH3–C≡CH > CH2=CH2 > CH3–CH3
    3. (3)CH≡CH > CH2=CH2 > CH3–C≡CH > CH3–CH3
    4. (4)CH3–CH3 > CH2=CH2 > CH3–C≡CH > CH≡CH
  16. 46.
    During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  17. 47.
    The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  18. 48.
    Given below are two statements:
    Statement (I): In partition chromatography, stationary phase is thin film of liquid present in the inert support.
    Statement (II): In paper chromatography, the material of paper acts as a stationary phase.
    choose the correct answer from the options given below:
    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 false
    4. (4)Both Statement I and Statement II are true
  19. 49.
    Identify the functional group that has electron donating inductive effect.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  20. 50.
    The—OH group of an alcohol or the—COOH group of a carboxylic acid can be
    replaced by ‐Cl using
    1. (1)phosphorus pentachloride
    2. (2)hypochlorous acid
    3. (3)chlorine
    4. (4)hydrochloric acid.
  21. 51.
    A liquid compound ( x ) can be purified by steam distillation only if it is
    1. (1)Not steam volatile, miscible with water
    2. (2)Steam volatile, miscible with water
    3. (3)Not steam volatile, immiscible with water
    4. (4)Steam volatile, immiscible with water
  22. 52.
    When 1 g of compound is subjected to Kjeldahl's method for estimation of nitrogen, was neutralized by ammonia evolved. The percentage of nitrogen in compound is:
    1. (1)0.21
    2. (2)21
    3. (3)42
    4. (4)0.42
  23. 53.
    Find the product for : CH3CH2–O–CH2–CH2–O–CH2–C6H5 + HI (excess)
    1. (1)HO–CH2CH2OH, C6H5CH2–I, CH3CH2–I
    2. (2)C6H5CH2–OH, CH3CH2–I, I–CH2CH2–OH
    3. (3)I–CH2CH2–I, C6H5CH2–I, CH3CH2–OH
    4. (4)HO–CH2CH2–OH, C6H5CH2–I, CH3CH2–OH
  24. 54.
    In chromotography technique, the purification of compound is independent of :
    1. (1)Mobility or flow of solvent system
    2. (2)Solubility of the compound
    3. (3)Length of the column or TLC Plate
    4. (4)Physical state of the pure compound Official
  25. 55.
    Given below are two statements:
    Statement I: Sublimation is used for the separation and purification of compounds with low melting point.
    Statement II: The boiling point of a liquid increases as the external pressure is reduced.
    In the light of the above statements, choose the correct answer from the options given below:
    1. (1)Both Statement I and Statement II are true
    2. (2)Statement I is true but Statement II is false
    3. (3)Both Statement I and Statement II are false
    4. (4)Statement I is false but Statement II is true
  26. 56.
    The decreasing order of electrical conductivity of the following aqueous solutions is :
    Formic acid ,
    Acetic acid
    Benzoic acid
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  27. 57.
    In Lassaigne's test for halogens, it is necessary to remove and from the sodium fusion extract, if nitrogen and sulphur are present. This is done by boiling the extract with . Identify and .
    1. (1) conc.
    2. (2) conc.
    3. (3) conc.
    4. (4) conc.
  28. 58.
    The correct order of increasing bond length of C–H, C–O, C–C and C=C is :
    1. (1)C–H < C=C < C–O < C–C
    2. (2)C–C < C=C < C–O < C–H
    3. (3)C–O < C–H < C–C < C=C
    4. (4)C–H < C–O < C–C < C=C
  29. 59.
    The number of σ and π bonds present in Pent-1-en-4-yne is
    1. (1)3, 10
    2. (2)9, 4
    3. (3)4, 9
    4. (4)10, 3
  30. 60.
    Consider thiol anion (RSΘ) and alkoxy anion (ROΘ). Which of the following statement is correct ?
    1. (1)RSΘ is less basic but more nucleophilic than ROΘ.
    2. (2)RSΘ is more basic and more nucleophilic than ROΘ.
    3. (3)RSΘ is more basic but less nucleophilic than ROΘ.
    4. (4)RSΘ is less basic and less nucleophilic than ROΘ.