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Principles Related to Practical Chemistry · Question 2

JEE Main 2026 (Online) 6th April Morning ShiftMCQMedium📈 Topic in 39% papers+4−1
1

Rf value for 2-methylpropene in a solvent system (Ethyl acetate + ether) is 0.42. 2-methylpropene is treated with dilute H2SO4 to give major organic product (X). Rf value for (X) in the same solvent system under identical condition will be:

  1. 0.42
  2. 0.82
  3. 0.62
  4. 0.12

Answer

(4) 0.12

Solution

Acid-catalysed hydration follows Markovnikov's rule (via the 3° carbocation):

(CH3)2C=CH2 + H2O H+ (CH3)3C-OH

⇒ X = 2-methylpropan-2-ol (tert-butyl alcohol)

Rf = distance moved by the substance from base linedistance moved by the solvent from base line

X has a polar –OH group (hydrogen bonding) ⇒ it is adsorbed more strongly on the polar stationary phase than the non-polar alkene ⇒ it moves less

⇒ Rf(X) < 0.42; among the options only 0.12 is smaller

Answer: (4)

JEE Main 2026 (Online) 6th April Morning Shift

Keep practising — Principles Related to Practical Chemistry

2

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) 6th April Evening Shift
3

Treatment of a gas 'X' with a freshly prepared ferrous sulphate solution gives a compound 'Y' as a brown ring. The compounds X and Y are:

  1. NO and [Fe(NO)]SO4
  2. NO2 and [Fe(NO2)]SO4
  3. N2O and [Fe(N2O)]SO4
  4. N2O4 and [Fe(N2O4)]SO4
JEE Main 2026 (Online) 6th April Evening 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) 5th April Morning Shift
5

In an estimation of sulphur by Carius method 0.2 g of the substance gave 0.6 g of BaSO4. The percentage of sulphur in the substance is %. (Given molar mass in g mol-1 S : 32, BaSO4 : 233)

JEE Main 2026 (Online) 5th April Morning Shift
6

Match List - I with List - II.

  1. A-II, B-III, C-I, D-IV
  2. A-II, B-IV, C-I, D-III
  3. A-II, B-IV, C-III, D-I
  4. A-IV, B-III, C-II, D-I
JEE Main 2026 (Online) 5th April Evening Shift
7

A paper dipped in a dil. H2SO4 solution of 'X' upon treatment with SO2 gas turns into green. The compound 'X' is :

  1. KI-starch
  2. KMnO4
  3. Pb(CH3COO)2
  4. K2Cr2O7
JEE Main 2026 (Online) 5th April Evening Shift
8

Identify the colour of compound 'X' in the sequence of the reaction. [figure]

  1. Violet
  2. Green
  3. Red
  4. Colourless
JEE Main 2026 (Online) 4th April Morning Shift
9

2.0 g of a bromo hydrocarbon (X) was subjected to Carius analysis, gave 3.36 g of AgBr. The percentage of carbon in the compound (X) is 26.7%. Total number of carbon atoms in the empirical formula for compound (X) is . (Given molar mass in g mol-1 H : 1, C : 12, Br : 80, Ag : 108)

JEE Main 2026 (Online) 4th April Morning Shift
10

Among Fe3+, Pb2+, Cu2+ and Mn2+, identify the one that gets precipitated out while passing H2S in presence of NH4OH as group reagent. The highest possible oxidation state of the corresponding metal is

  1. +3
  2. +4
  3. +2
  4. +7
JEE Main 2026 (Online) 4th April Evening Shift
11

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

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

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