PYQ Vault
EbooksTutor

Day 88: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Amines. This type asked 2 times: 28 Jun 2022, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 2 of this type

    38
    A student performed analysis of aliphatic organic compound ' X ' which on analysis gave C=61.01%C = 61.01\%, H=15.25%, N=23.74%H = 15.25\%,\text{ }N = 23.74\%. This compound, on treatment with HNO2/H2OHNO_{2}/H_{2}O produced another compound ' Y ' which did not contain any nitrogen atom. However, the compound ' Y ' upon controlled oxidation produced another compound ' ZZ ' that responded to iodoform test. The structure of ' X ' is:

    Tap an option to check your answer.

  2. Question 2

    Electrochemistry. This type asked 2 times: 4 Apr 2024, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 2 of this type

    48
    For a strong electrolyte, Λm\Lambda_{m} increases slowly with dilution and can be represented by the equation Λm=Λm∘−Ac1/2\Lambda_{m} = \Lambda_{m}^{\circ} - Ac^{1/2}. Molar conductivity values of the solutions of a strong electrolyte AB at 18∘C18^{\circ}C are given below :
    cc (mol L−1mol\ L^{-1})0.040.090.160.25
    Λm\Lambda_{m} (S cm2 mol−1S\ cm^{2}\ mol^{-1})96.195.795.394.9
    The value of the constant A based on the above data [in S cm2 mol−1/(mol/L)1/2S\ cm^{2}\ mol^{-1}/(mol/L)^{1/2} unit] is ____\_\_\_\_ .

  3. Question 3

    Biomolecules. This type asked 2 times: 29 Jan 2023, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 2 of this type

    39
    In the given pentapeptide, find out an essential amino acid (Y) and the sequence present in the pentapeptide: Choose the correct answer from the options given below:

    Tap an option to check your answer.

  4. Question 4

    Aldehydes, Ketones and Carboxylic Acids. This type asked 2 times: 4 Apr 2024, 24 Jan 2026 S2. This one: 24 Jan 2026 S2 See all 2 of this type

    39
    Given below are two statements : Statement I: Cross aldol condensation between two different aldehydes will always produce four different products. Statement II : When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only. In the light of the above statements, choose the correct answer from the options given below :

    Tap an option to check your answer.

  5. Question 5

    Chemical Kinetics. This type asked 2 times: 2 Apr 2025, 24 Jan 2026 S1. This one: 24 Jan 2026 S1 See all 2 of this type

    27
    A→DA \rightarrow D is an endothermic reaction occurring in three steps (elementary). (i) A→BΔHi=+veA \rightarrow B\Delta H_{i}= + ve (ii) B→CΔHii=−veB \rightarrow C\Delta H_{ii}= - ve (iii) C→DΔHiii =−veC \rightarrow D\Delta H_{\text{iii~}}= - ve Which of the following graphs between potential energy ( y -axis) vs reaction coordinate ( x -axis) correctly represents the reaction profile of A→DA \rightarrow D ?

    Tap an option to check your answer.