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Set 19 of 22 · Questions 541-570 of 650

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NEET Chemistry · General Organic Chemistry · Set 19 (Q541-570)

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  1. 541.
    In a nucleophilic substitution reaction :
    R–Br + R–Cl +
    Which one of the following undergoes complete inversion of configuration ?
    1. (1)Br
    2. (2)Br
    3. (3)Br
    4. (4)Br
  2. 542.
    Which one of the following does not have hybridized carbon?
    1. (1)acetone
    2. (2)acetic acid
    3. (3)acetonitrile
    4. (4)acetamide
  3. 543.
    Elimination of HBr from 2-bromobutane result in the formation of :
    1. (1)Predominantly 2-butyne
    2. (2)Predominantly 1-butene
    3. (3)Predominantly 2-butene
    4. (4)Equimolar mixture of 1 and 2-butene
  4. 544.
    In allene (), the type(s) of hybridisation of the carbon atoms is (are) :
    1. (1)sp and
    2. (2)sp and
    3. (3)only
    4. (4) and
  5. 545.
    A solution of ( – ) – 1 – chloro–1–phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :
    1. (1)carbanion
    2. (2)carbene
    3. (3)carbocation
    4. (4)free radical
  6. 546.
    All structures given below are of vitamin C. Most stable of them is : OH
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  7. 547.
    Treatment of cyclopentanone methyl lithium gives which of the
    following species?
    1. (1)Cyclopentanonyl radical
    2. (2)Cyclopentanonyl biradical
    3. (3)Cyclopentanonyl anion
    4. (4)Cyclopentanonyl cation
  8. 548.
    The main product of the following reaction is :
    C6H5CH2CH(OH)CH(CH3)2
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  9. 549.
    The enolic form of ethyl acetoacetate as shown below has
    1. (1)9 sigma bonds and 2 pi‐bonds
    2. (2)9 sigma bonds and 1 pi‐bond
    3. (3)18 sigma bonds and 2 pi‐bonds
    4. (4)16 sigma bonds and 1 pi‐bond.
  10. 550.
    According to IUPAC system, the compound
    is named as
    1. (1)Cyclohex-1-en-2-ol
    2. (2)1-Hydroxyhex-2-ene
    3. (3)Cyclohex-1-en-3-ol
    4. (4)Cyclohex-2-en-1-ol
  11. 551.
    The IUPAC name(s) of the following compound is (are)
    1. (1)4-methylchlorobenzene
    2. (2)1-chlorotoluene
    3. (3)1-chloro-4-methylbenzene
    4. (4)1-methyl-4-chlorobenzene
  12. 552.
    Which one of the following compounds is not aromatic ?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  13. 553.
    C8H16 that can form cis-trans geometrical isomers and also has a chiral centre, is
    1. (1)
    2. (2)
    3. (3)Both of these
    4. (4)None of these
  14. 554.
    IUPAC name of following compound is:
    1. (1)1-Ethyl-5, 5-dimethylcyclohexane
    2. (2)3-Ethyl-1,1-dimethylcyclohexane
    3. (3)1-Ethyl-3, 3-dimethylcyclohexane
    4. (4)1,1-Dimethyl-3-ethylcyclohexane
  15. 555.
    The correct order of basicity for the following molecules is:
    1. (1)R P Q
    2. (2)P Q R
    3. (3)
    4. (4)Q P R
  16. 556.
    The isomeric deuterated bromide with molecular formula DBr having two chiral carbon atoms is
    1. (1)2-Bromo-1 -dcuterobutane
    2. (2)2-Bromo-2-deuterobutane
    3. (3)2-Bromo-3-deuterobutane
    4. (4)2-Bromo-1 -deutero-2-methylpropane
  17. 557.
    The number of stereoisomers possible for 1,2 dimethyl cyclopropane is:
    1. (1)One
    2. (2)Four
    3. (3)Two
    4. (4)Three
  18. 558.
    On treatment of the following compound with a strong acid, the most susceptible site for bond cleavage is :
    1. (1) –
    2. (2) –
    3. (3) –
    4. (4) –
  19. 559.
    Identify structure of 2,3-dibromo-1-phenylpentane.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  20. 560.
    2‐Methyl‐2‐butene will be represented as
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  21. 561.
    A solution of (–)-1-chloro-1-phenylethane in toluene racemises slowly in the presence of a small amount of , due to the formation of :
    1. (1)carbanion
    2. (2)carbine
    3. (3)carbocation
    4. (4)free radical
  22. 562.
    IUPAC name of following hydrocarbon is :
    1. (1)2-Ethyl-3,6-dimethylheptane
    2. (2)2,5,6-Trimethyloctane
    3. (3)3,4,7-Trimethyloctane
    4. (4)2-Ethyl-2,6-diethylheptane
  23. 563.
    Point out incorrect sawhorse drawing(s) for the following compound.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  24. 564.
    The increasing order of the acidity of the following carboxylic acids is :
    1. (1)I < III < II < IV
    2. (2)IV < II < III < I
    3. (3)II < IV < III < I
    4. (4)III < II < IV < I
  25. 565.
    Functional group present in sulphonic acids is :
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  26. 566.
    In which of the following compounds there is more than one kind of
    hybridization for carbon?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  27. 567.
    Which one of the following pairs of isomers is an example of metamerism ?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  28. 568.
    In which of the following compounds, the C–Cl bond ionisation shall give most stable carbonium ion ?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  29. 569.
    The correct structure of 4-Bromo-3-methylbut-1-ene is :
    1. (1)Br – CH = C (CH3)2
    2. (2)CH2 = CH – CH(CH3) – CH2Br
    3. (3)CH2 = C(CH3)CH2CH2Br
    4. (4)CH3 – C(CH3) = CHCH2 – Br
  30. 570.
    The major product obtained on acid–catalysed hydration of 2-phenylpropene is
    1. (1)2-Phenylpropan-2-ol
    2. (2)2-Phenylpropan-1-ol
    3. (3)3-Phenylpropan-2-ol
    4. (4)1-Phenylpropan-1-ol