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Isomerism

JEE Main 2024 (Online) 5th April Morning ShiftMCQEasy📈 Topic in 7% papers+4−1
Ques. 1JEE 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)

Answer

(3) Both (A) and (R) are true and (R) is the correct explanation of (A)

Solution

Dipole moment is a vector ⇒ net = vector sum of the bond moments.

[figure]

cis: both C–CH3 moments point to the same side ⇒ they add ⇒ > 0 (more polar) ⇒ (A) is true

trans: the two equal C–CH3 moments are opposite ⇒ they cancel ⇒ = 0 ⇒ (R) is true

∵ the cis form is more polar exactly because its bond moments do not cancel as in the trans form ⇒ (R) explains (A)

Answer: (3)

Keep practising — Isomerism

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

The number of different chain isomers for C7H16 is .

Ques. 4JEE Main 2024, 1 February (Morning Shift)

Number of optical isomers possible for 2-chlorobutane .

Ques. 5JEE Main 2024, 1 February (Evening Shift)

Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2-methylbutane is .

Ques. 6JEE Main 2024, 30 January (Evening Shift)

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

Ques. 7JEE 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. 8JEE Main 2024, 29 January (Evening Shift)

Which one of the following will show geometrical isomerism?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9JEE Main 2024, 27 January (Morning Shift)

Highest enol content will be shown by:

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE 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. 11JEE 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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