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Isomerism

JEE Main 2024 (Online) 30th January Evening ShiftNumericalHard📈 Topic in 2% papers+4
Ques. 1JEE Main 2024, 30 January (Evening Shift)

Number of geometrical isomers possible for the given structure is/are . [figure]

Answer

4

Solution

Stereogenic C=C: the two terminal CHD=C(CH3)– and the central C=CH–CH3.

∵ the molecule is symmetrical, the central C=C is stereogenic only when its two arms differ

Terminal pair EE or ZZ ⇒ arms identical ⇒ central C=C not stereogenic ⇒ 2 isomers

Terminal pair EZ ⇒ arms different ⇒ central C=C is E or Z ⇒ 2 isomers

∴ Total = 2 + 2 = 4

Answer: 4

Keep practising — Isomerism

Ques. 2JEE 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 .

Ques. 3JEE Main 2024, 29 January (Evening Shift)

Which one of the following will show geometrical isomerism?

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

Highest enol content will be shown by:

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5JEE 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. 6JEE 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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