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Hydrocarbons · Question 10

RE-NEET (UG) 2024MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(2) R1 = CH3; R2 = CH3; R3 = CH3

Solution

Controlled oxidation of an alkane by KMnO4 to the corresponding alcohol takes place only at a tertiary C–H bond (alkanes having a tertiary H).

With R1 = R2 = R3 = CH3, the alkane is 2-methylpropane:

(CH3)3CH KMnO4 (CH3)3COH (2-methylpropan-2-ol)

Answer: (2)

RE-NEET (UG) 2024

Keep practising — Hydrocarbons

2

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 syllabusNEET (UG) 2023
3

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
NEET (UG) 2022
4

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
NEET (UG) 2022 (Phase 2)
5

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
NEET (UG) 2022 (Phase 2)
6

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2021
7

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
NEET (UG) 2021
8

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
NEET (UG) 2020
9

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2020
10

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

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

The most suitable reagent for the following conversion, is : [figure]

  1. Zn / HCl
  2. Hg2+/H+, H2O
  3. Na / liquid NH3
  4. H2, Pd/C, quinoline
NEET (UG) 2019

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