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Hydrocarbons · Question 7

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

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct

Answer

(1) Both Statement I and Statement II are correct

Solution

Statement I: b.p. n-pentane (309 K) > isopentane (301 K) > neopentane (282.5 K). Correct.

Statement II: With branching the molecule becomes nearly spherical, the surface area of contact decreases, van der Waals forces become weaker and the boiling point falls (NCERT). Correct, and it explains Statement I.

Answer: (1)

NEET (UG) 2024

Keep practising — Hydrocarbons

2

For the given reaction: [figure] 'P' is

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

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
RE-NEET (UG) 2024
4

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
RE-NEET (UG) 2024
5

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
6

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
7

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)
8

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)
9

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2021
10

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
11

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

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