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Isomerism

JEE Main 2024 (Online) 30th January Evening ShiftNumericalMedium📈 Topic in 14% papers+4
Ques. 1JEE Main 2024, 30 January (Evening Shift)

2-chlorobutane + Cl2 C4H8Cl2 (isomers) Total number of optically active isomers shown by C4H8Cl2, obtained in the above reaction is .

Answer

6

Solution

Free-radical chlorination of 1CH3- 2CHCl- 3CH2- 4CH3 replaces one H (* = chiral C):

Cl at C-1: ClCH2- CHCl-CH2-CH3 ⇒ 2 (d, l)

Cl at C-2: CH3-CCl2-CH2-CH3 ⇒ 0 (no chiral C)

Cl at C-3: CH3- CHCl- CHCl-CH3 ⇒ 2 (d, l; meso form is inactive)

Cl at C-4: CH3- CHCl-CH2-CH2Cl ⇒ 2 (d, l)

∴ Optically active isomers = 2 + 0 + 2 + 2 = 6

Answer: 6

Keep practising — Isomerism

Ques. 2JEE Main 2024, 29 January (Evening Shift)

Which one of the following will show geometrical isomerism?

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

Highest enol content will be shown by:

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

3-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for 'A' is .

Ques. 5JEE Main 2024, 27 January (Evening Shift)

Total number of compounds with Chiral carbon atoms from following is . [figure] CH3-CH2-CH(NO2)-COOH CH3-CH2-CHBr-CH2-CH3 CH3-CH(I)-CH2-NO2 CH3-CH2-CH(OH)-CH2OH CH3- I |CH-CH(I)-C2H5

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