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Organic Chemistry – Some Basic Principles and Techniques · Question 5

JEE Main 2026 (Online) 5th April Evening ShiftMCQEasy📈 Topic in 6% papers+4−1
1

IUPAC name of the some alkenes are given below. Find out the correct stability order. Choose the correct answer from the options given below :

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

Answer

(1) C > A > B > D

Solution

Stability of alkenes ∝ number of α-H (hyperconjugative structures):

C. 2,3-Dimethylbut-2-ene, (CH3)2C=C(CH3)2: tetrasubstituted, 12 α-H

A. 2-Methylbut-2-ene, (CH3)2C=CH-CH3: trisubstituted, 9 α-H

B. cis-But-2-ene, CH3-CH=CH-CH3: disubstituted, 6 α-H

D. Prop-1-ene, CH3-CH=CH2: monosubstituted, 3 α-H

∴ Stability: C > A > B > D (also seen from the decreasing heats of hydrogenation)

Answer: (1)

JEE Main 2026 (Online) 5th April Evening Shift

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

2

Identify the correct IUPAC name of hydrocarbon (x) containing three primary carbon atoms and with molar mass 72 g mol-1.

  1. 1, 1 - Dimethylcyclopropane
  2. 2, 2 - Dimethylpropane
  3. 2 - Methylbutane
  4. n-pentane
JEE Main 2026 (Online) 5th April Evening Shift
3

Increasing order of electron withdrawing power of following functional groups is : a. -CN b. -COOH c. -NO2 d. -I

  1. c < b < d < a
  2. c < a < b < d
  3. d < b < a < c
  4. a < b < c < d
JEE Main 2026 (Online) 4th April Morning Shift
4

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

  1. A-III, B-I, C-II, D-IV
  2. A-III, B-IV, C-II, D-I
  3. A-III, B-IV, C-I, D-II
  4. A-I, B-III, C-IV, D-II
JEE Main 2026 (Online) 4th April Evening Shift
5

Consider the following molecules/species : [figure] The correct order of carbon-oxygen double bond length is :

  1. x > y > z
  2. y > z > x
  3. z > x > y
  4. x > z > y
JEE Main 2026 (Online) 4th April Evening Shift
6

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
JEE Main 2026 (Online) 4th April Evening Shift
7

The strongest conjugate acid will result from:

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2026 (Online) 4th April Evening Shift
8

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
9

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
10

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
11

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

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