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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 27th January Morning ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2024, 27 January (Morning Shift)

IUPAC name of following compound (P) is: [figure]

  1. 1-Ethyl-5,5-dimethylcyclohexane
  2. 3-Ethyl-1,1-dimethylcyclohexane
  3. 1-Ethyl-3,3-dimethylcyclohexane
  4. 1,1-Dimethyl-3-ethylcyclohexane

Answer

(2) 3-Ethyl-1,1-dimethylcyclohexane

Solution

[figure]

C-1 = C bearing two CH3 ⇒ locants 1, 1, 3

C-1 = ethyl carbon ⇒ locants 1, 3, 3 ⇒ 1, 1, 3 is the lower set

∵ lowest locant set is chosen, and prefixes are written alphabetically (ethyl before methyl)

⇒ 3-Ethyl-1,1-dimethylcyclohexane

Answer: (2)

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Ques. 2JEE Main 2024, 27 January (Morning Shift)

Among the given organic compounds, the total number of aromatic compounds is [figure]

Ques. 3JEE Main 2024, 27 January (Evening Shift)

The order of relative stability of the contributing structure is : [figure] Choose the correct answer from the options given below :

  1. I = II = III
  2. I > II > III
  3. III > II > I
  4. II > I > III
Ques. 4JEE Main 2024, 27 January (Evening Shift)

Bond line formula of HOCH(CN)2 is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5JEE Main 2024, 27 January (Evening Shift)

The molecular formula of second homologue in the homologous series of mono carboxylic acids is

  1. C2H4O2
  2. C2H2O2
  3. CH2O
  4. C3H6O2

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