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Organic Chemistry – Some Basic Principles and Techniques · Question 18

JEE Main 2026 (Online) 24th January Evening ShiftMCQMedium📈 Topic in 3% papers+4−1
1

Find out the statements which are not true. Choose the correct answer from the options given below :

  1. A, D & E only
  2. A, C & D only
  3. B & D only
  4. B, D & E only

Answer

(3) B & D only

Solution

A. As per NCERT, a resonance structure with more covalent bonds and less separation of opposite charges is more stable. ⇒ True.

B. In the electromeric effect the π-electrons shift towards the atom to which the attacking reagent gets attached. With an electrophile this gives the +E effect; with a nucleophile, the π-electrons move away from the attacked atom (–E effect). The statement interchanges the two. ⇒ Not true.

C. The inductive effect makes bonds polar; this permanent polarity gives polar compounds their dipole moment and the strong dipole–dipole attractions behind their high melting and boiling points. ⇒ True.

D. More alkyl groups on the doubly bonded carbons ⇒ more hyperconjugation ⇒ more stable alkene ⇒ lower heat of hydrogenation (e.g. (CH3)2C=C(CH3)2 releases less heat than CH2=CH2). ⇒ Not true.

E. Greater s-character holds the lone pair closer to the nucleus ⇒ carbanion stability: sp > sp2 > sp3. ⇒ True.

∴ Statements B and D are not true.

Answer: (3)

JEE Main 2026 (Online) 24th January Evening Shift

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2

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

  1. Statement I is false but Statement II is true
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are true
  4. Both Statement I and Statement II are false
JEE Main 2026 (Online) 23rd January Evening Shift
3

The IUPAC name of the following compound is : [figure]

  1. 2-bromo-5-methylhexylpropanoate
  2. n-propyl-1-bromo-4-methylhexanoate
  3. n-propyl-2-bromo-5-methylheptanoate
  4. 2-bromo-5-methylpropanoate
JEE Main 2026 (Online) 22nd January Evening Shift
4

From the following, the least stable structure is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2026 (Online) 21st January Morning Shift
5

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

  1. A-IV, B-II, C-III, D-I
  2. A-II, B-III, C-I, D-IV
  3. A-III, B-IV, C-I, D-II
  4. A-III, B-IV, C-II, D-I
JEE Main 2025 (Online) 8th April Evening Shift
6

What is the correct IUPAC name of the compound? [figure]

  1. 1-Ethylcyclopent-2-en-3-ol
  2. 4-Ethylcyclopent-2-en-1-ol
  3. 1-Ethyl-3-hydroxycyclopent-2-ene
  4. 4-Ethyl-1-hydroxycyclopent-2-ene
JEE Main 2025 (Online) 8th April Evening Shift
7

Which of the following is the correct IUPAC name of given organic compound (X)? [figure]

  1. 4-Bromo-3-methylbut-2-ene
  2. 1-Bromo-2-methylbut-2-ene
  3. 3-Bromo-3-methylprop-2-ene
  4. 2-Bromo-2-methylbut-2-ene
JEE Main 2025 (Online) 7th April Morning Shift
8

Given below are two statements. In the light of the above statements, choose the correct answer from the options given below:

  1. Both Statement I and Statement II are true
  2. Statement I is true but Statement II is false
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
JEE Main 2025 (Online) 4th April Morning Shift
9

The IUPAC name of the following compound is: HC C-CH2- OH |CH-CH2-CH=CH2

  1. 4-Hydroxyhept-6-en-1-yne
  2. Hept-1-en-6-yn-4-ol
  3. Hept-6-en-1-yn-4-ol
  4. 4-Hydroxyhept-1-en-6-yne
JEE Main 2025 (Online) 4th April Evening Shift
10

In which pairs, the first ion is more stable than the second?

  1. (A) & (B) only
  2. (B) & (D) only
  3. (A) & (C) only
  4. (B) & (C) only
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11

The correct order of basicity for the following molecules is : [figure]

  1. R > P > Q
  2. P > Q > R
  3. R > Q > P
  4. Q > P > R
JEE Main 2025 (Online) 4th April Evening Shift

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Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry