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Haloalkanes and Haloarenes

NEET (UG) 2024MCQEasy📈 Topic in 25% papers+4−1
Ques. 1NEET (UG) 2024

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

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

Answer

(1) [figure]

Solution

PBr3 replaces the -OH group by -Br on the same carbon, so A is 1-bromo-2-methylcyclohexane.

Alcoholic KOH on heating causes dehydrohalogenation ( -elimination). By Saytzeff rule the more substituted alkene is the major product: H is removed from the -carbon carrying CH3.

B is 1-methylcyclohexene (double bond between the ring carbon bearing CH3 and the carbon that carried Br).

Answer: (1)

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Ques. 2RE-NEET (UG) 2024

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
Ques. 3RE-NEET (UG) 2024

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
Ques. 4NEET (UG) 2023

The given compound [figure] is an example of .

  1. aryl halide
  2. allylic halide
  3. vinylic halide
  4. benzylic halide
Ques. 5NEET (UG) 2023

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

  1. [figure]
  2. C4H10
  3. HC C Na
  4. [figure]
Ques. 6NEET (UG) 2022

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
Ques. 7NEET (UG) 2022 (Phase 2)

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
Ques. 8NEET (UG) 2022 (Phase 2)

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)
Ques. 9NEET (UG) 2021

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
Ques. 10NEET (UG) 2021

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
Ques. 11NEET (UG) 2020

Elimination reaction of 2-Bromopentane to form pent-2-ene is :

  1. A, C and D only
  2. B, C and D only
  3. A, B and D only
  4. A, B and C only

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