PYQSide ExamsMy practice

Haloalkanes and Haloarenes · Question 5

NEET (UG) 2024MCQEasy📈 Topic in 50% papers+4−1
1

The compound that will undergo SN1 reaction with the fastest rate is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(4) [figure]

Solution

Rate of SN1 depends on the stability of the carbocation formed in the slow step.

(1) Cyclohexylmethyl bromide → 1 carbocation (least stable).

(2) Bromocyclohexane → 2 carbocation.

(3) Bromobenzene: C–Br has partial double-bond character and the phenyl cation is very unstable → no SN1.

(4) 1-Bromo-1-phenylethane → 2 benzylic carbocation C6H5 +CHCH3, stabilised by resonance with the ring (most stable).

(4) reacts fastest.

Answer: (4)

NEET (UG) 2024

Keep practising — Haloalkanes and Haloarenes

2

Major products A and B formed in the following reaction sequence, are [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2024
3

The major product C in the below mentioned reaction is: CH3CH2CH2Br [ ]alc. KOH A HBr B [ ]aq. KOH C

  1. Propan-1-ol
  2. Propan-2-ol
  3. Propane
  4. Propyne
RE-NEET (UG) 2024
4

The following reaction method [figure] is not suitable for the preparation of the corresponding haloarene products, due to high reactivity of halogen, when X is :

  1. F
  2. I
  3. Cl
  4. Br
RE-NEET (UG) 2024
5

The given compound [figure] is an example of .

  1. aryl halide
  2. allylic halide
  3. vinylic halide
  4. benzylic halide
NEET (UG) 2023
6

Identify the final product [D] obtained in the following sequence of reactions. [figure]

  1. [figure]
  2. C4H10
  3. HC C Na
  4. [figure]
NEET (UG) 2023
7

Which of the following sequence of reactions is suitable to synthesize chlorobenzene?

  1. Benzene, Cl2, anhydrous FeCl3
  2. Phenol, NaNO2, HCl, CuCl
  3. [figure] , HCl
  4. [figure] , HCl, Heating
NEET (UG) 2022
8

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

  1. (A) is not correct but (R) is correct
  2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
  3. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  4. (A) is correct but (R) is not correct
NEET (UG) 2022 (Phase 2)
9

Predict the order of reactivity of the following four isomers towards SN2 reaction. (I) CH3CH2CH2CH2Cl (II) CH3CH2CH(Cl)CH3 (III) (CH3)2CHCH2Cl (IV) (CH3)3CCl

  1. (IV) > (II) > (III) > (I)
  2. (IV) > (III) > (II) > (I)
  3. (I) > (II) > (III) > (IV)
  4. (I) > (III) > (II) > (IV)
NEET (UG) 2022 (Phase 2)
10

The major product formed in dehydrohalogenation reaction of 2-bromopentane is pent-2-ene. This product formation is based on?

  1. Hückel's Rule
  2. Saytzeff's Rule
  3. Hund's Rule
  4. Hofmann Rule
NEET (UG) 2021
11

The correct sequence of bond enthalpy of 'C-X' bond is :

  1. CH3-Cl > CH3-F > CH3-Br > CH3-I
  2. CH3-F < CH3-Cl < CH3-Br < CH3-I
  3. CH3-F > CH3-Cl > CH3-Br > CH3-I
  4. CH3-F < CH3-Cl > CH3-Br > CH3-I
NEET (UG) 2021

All Haloalkanes and Haloarenes PYQs →

PDFDownload Haloalkanes and Haloarenes PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical KineticsSurface Chemistry
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPolymersChemistry in Everyday LifePrinciples Related to Practical Chemistry