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Organic Chemistry – Some Basic Principles and Techniques · Question 10

JEE Main 2026 (Online) 4th April Evening ShiftMCQMedium📈 Topic in 6% papers+4−1
1

The descending order of acidity among the following compounds is : [figure] Choose the correct answer from the options given below :

  1. B > D > E > A > C
  2. D > B > E > A > C
  3. C > A > B > D > E
  4. D > E > B > A > C

Answer

(4) D > E > B > A > C

Solution

Carboxylic acids are stronger than phenols: in a carboxylate ion the negative charge is spread over two equivalent, electronegative O atoms.

Acids: −NO2 (−I, −R) stabilises the carboxylate ⇒ D (p-nitrobenzoic acid, pKa 3.41) > E (benzoic acid, pKa 4.19)

Phenols: −NO2 at para delocalises the negative charge of phenoxide (−R) ⇒ B (p-nitrophenol, pKa 7.1) > A (phenol, pKa 10.0)

−OCH3 at para donates electrons (+R) and destabilises phenoxide ⇒ C (p-methoxyphenol, pKa 10.2) is the weakest.

∴ D > E > B > A > C

Answer: (4)

JEE Main 2026 (Online) 4th April Evening Shift

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

2

The strongest conjugate acid will result from:

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2026 (Online) 4th April Evening Shift
3

In IUPAC nomenclature, the correct order of decreasing priority of functional group is :

  1. -CONH2, >C=O, -CHO, -NH2, -C C-
  2. -CONH2, -COOCH3, -CHO, -NH2, -OH
  3. -CONH2, -CHO, >C=O, -NH2, -C C-
  4. -CONH2, -CHO, -CN, -NH2, -C C-
JEE Main 2026 (Online) 2nd April Morning Shift
4

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. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 2nd April Evening Shift
5

CORRECT order of stability for the following is CH2=CH-, CH3-CH2-, CH C-

  1. CH C- > CH3-CH2- > CH2=CH-
  2. CH2=CH- > CH C- > CH3-CH2-
  3. CH C- > CH2=CH- > CH3-CH2-
  4. CH3-CH2- > CH2=CH- > CH C-
JEE Main 2026 (Online) 28th January Morning Shift
6

The cyclic cations having the same number of hyperconjugation are : Choose the correct answer from the options given below :

  1. B and C Only
  2. A and B Only
  3. A and C Only
  4. A, C and D Only
JEE Main 2026 (Online) 28th January Evening Shift
7

Arrange the following alkenes in decreasing order of stability. [figure] Choose the correct answer from the options given below:

  1. III > I > II > IV
  2. III > II > I > IV
  3. I > III > II > IV
  4. I > III > IV > II
JEE Main 2026 (Online) 24th January Morning Shift
8

Arrange the following carbanions in the decreasing order of stability. I. p-Br-C6H4- CH2 II. C6H5- CH2 III. p-CH3O-C6H4- CH2 IV. p-CHO-C6H4- CH2 V. p-CH3-C6H4- CH2 Choose the correct answer from the options given below :

  1. I > II > IV > V > III
  2. IV > II > I > III > V
  3. I > IV > II > V > III
  4. IV > I > II > V > III
JEE Main 2026 (Online) 24th January Morning Shift
9

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
JEE Main 2026 (Online) 24th January Evening Shift
10

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
11

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

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