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Isomerism

JEE Main 2025 (Online) 22nd January Morning ShiftMCQEasy📈 Topic in 14% papers+4−1
Ques. 1JEE Main 2025, 22 January (Morning Shift)

How many different stereoisomers are possible for the given molecule? [figure]

  1. 2
  2. 1
  3. 3
  4. 4

Answer

(4) 4

Solution

CH3-CH(OH)-CH=CH-CH3: one chiral centre (C-2) and one stereogenic double bond (C-3=C-4).

2 2 = 4 stereoisomers:

[figure]

[figure]

Answer: (4)

Keep practising — Isomerism

Ques. 2JEE Main 2025, 22 January (Morning Shift)

The incorrect statements regarding geometrical isomerism are : Choose the correct answer from the options given below :

  1. A and E Only
  2. A, D and E Only
  3. C, D and E Only
  4. B and C Only
Ques. 3JEE Main 2024, 9 April (Evening Shift)

Total number of stereo isomers possible for the given structure : [figure]

  1. 4
  2. 2
  3. 8
  4. 3
Ques. 4JEE Main 2024, 8 April (Morning Shift)

The number of optical isomers in following compound is : . [figure]

Ques. 5JEE Main 2024, 8 April (Evening Shift)

The number of optically active compounds from the following is . [figure] CH3-CH2-CH2-CH2-OH, CH3-CH2- Cl |CH-CH3, CH3-CH2-CH2-CH2-Cl, (CH3)2CH-CH2-CH2-Cl

Ques. 6JEE Main 2024, 6 April (Morning Shift)

Which of the following is metamer of the given compound (X) ? [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7JEE Main 2024, 6 April (Evening Shift)

The incorrect statement regarding the geometrical isomers of 2-butene is :

  1. cis-2-butene and trans-2-butene are not interconvertible at room temperature.
  2. trans-2-butene is more stable than cis-2-butene.
  3. cis-2-butene has less dipole moment than trans-2-butene.
  4. cis-2-butene and trans-2-butene are stereoisomers.
Ques. 8JEE Main 2024, 5 April (Morning Shift)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

  1. (A) is true but (R) is false
  2. (A) is false but (R) is true
  3. Both (A) and (R) are true and (R) is the correct explanation of (A)
  4. Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
Ques. 9JEE Main 2024, 5 April (Evening Shift)

Match List - I with List - II. Choose the correct answer from the options given below :

  1. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
  2. (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  3. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  4. (A)-(I), (B)-(III), (C)-(IV), (D)-(II)
Ques. 10JEE Main 2024, 4 April (Morning Shift)

The number of different chain isomers for C7H16 is .

Ques. 11JEE Main 2024, 1 February (Morning Shift)

Number of optical isomers possible for 2-chlorobutane .

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