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Hydrocarbons

RE-NEET (UG) 2024MCQEasy📈 Topic in 62% papers+4−1
Ques. 1RE-NEET (UG) 2024

Baeyer's reagent is :

  1. Acidic potassium permanganate solution
  2. Acidic potassium dichromate solution
  3. Cold, dilute, aqueous solution of potassium permanganate
  4. Hot, concentrated solution of potassium permanganate

Answer

(3) Cold, dilute, aqueous solution of potassium permanganate

Solution

Baeyer's reagent is a cold, dilute, aqueous (slightly alkaline) solution of KMnO4.

It is used to test unsaturation: the purple colour disappears as alkenes are converted into vicinal glycols, e.g.

CH2=CH2 + H2O + [O] dil. KMnO4 HOCH2-CH2OH

Answer: (3)

Keep practising — Hydrocarbons

Ques. 2RE-NEET (UG) 2024

The alkane that can be oxidized to the corresponding alcohol by KMnO4 as per the equation [figure] is, when :

  1. R1 = H; R2 = H; R3 = H
  2. R1 = CH3; R2 = CH3; R3 = CH3
  3. R1 = CH3; R2 = H; R3 = H
  4. R1 = CH3; R2 = CH3; R3 = H
Ques. 3NEET (UG) 2023

Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is :

  1. 32
  2. 30
  3. 18
  4. 16
Out of syllabus
Ques. 4NEET (UG) 2022

Compound X on reaction with O3 followed by Zn/H2O gives formaldehyde and 2-methyl propanal as products. The compound X is

  1. 3-Methylbut-1-ene
  2. 2-Methylbut-1-ene
  3. 2-Methylbut-2-ene
  4. Pent-2-ene
Ques. 5NEET (UG) 2022 (Phase 2)

The decreasing order of boiling points of the following alkanes is : Choose the correct answer from the options given below :

  1. A > E > C > B > D
  2. A > C > E > D > B
  3. C > D > A > E > B
  4. A > E > B > C > D
Ques. 6NEET (UG) 2022 (Phase 2)

The incorrect method for the synthesis of alkenes is

  1. Treating vicinal dihalides with Zn metal
  2. Treating of alkynes with Na in liquid NH3
  3. Heating alkyl halides with alcoholic KOH
  4. Treating alkyl halides in aqueous KOH solution
Ques. 7NEET (UG) 2021

The major product of the following chemical reaction is : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8NEET (UG) 2021

CH3CH2COO-Na+ [Heat]NaOH, +? CH3CH3 + Na2CO3 Consider the above reaction and identify the missing reagent/chemical.

  1. DIBAL-H
  2. B2H6
  3. Red Phosphorus
  4. CaO
Ques. 9NEET (UG) 2020

Which of the following alkane cannot be made in good yield by Wurtz reaction?

  1. 2, 3-Dimethylbutane
  2. n-Heptane
  3. n-Butane
  4. n-Hexane
Ques. 10NEET (UG) 2020

An alkene on ozonolysis gives methanal as one of the products, Its structure is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11NEET (UG) 2019

Among the following, the reaction that proceeds through an electrophilic substitution, is :

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

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