PYQ Vault

Day 475: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 5 Apr 2024

    39
    Identify 'A' in the following reaction:

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  2. Question 2

    Amines. Asked once: 31 Jan 2024

    143
    A compound (x) with molar mass 108 g mol−1108\text{ }g{\text{ }mol}^{- 1} undergoes acetylation to give product with molar mass 192 g mol−1192\text{ }g{\text{ }mol}^{- 1}. The number of amino groups in the compound (x)(x) is ___
  3. Question 3

    Biomolecules. Asked once: 25 Jan 2023

    46
    Match items of Row I with those of Row II. Row I: the ring structures (A), (B), (C) and (D) shown in the figure. Row II: (i) α\alpha-D-(-)-Fructofuranose, (ii) β\beta-D-(-)-Fructofuranose, (iii) α\alpha-D-(+)-Glucopyranose, (iv) β\beta-D-(+)-Glucopyranose Correct match is

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 25 Jan 2023

    136
    Statement I: Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative centre and head pointing towards the positive centre. Statement II: The crossed arrow of the dipole moment symbolizes the direction of the shift of charges in the molecules. In the light of the above statements, choose the most appropriate answer from the options given below:

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  5. Question 5

    Chemical Kinetics. Asked once: 6 Apr 2024

    148
    Consider the two different first order reactions given below A+B→CA + B \rightarrow C (Reaction 1) P→QP \rightarrow Q (Reaction 2) The ratio of the half-life of Reaction 1 : Reaction 2 is 5:25:2. If t1t_{1} and t2t_{2} represent the time taken to complete 2/32/3 and 4/54/5 of Reaction 1 and Reaction 2, respectively, then the value of the ratio t1:t2t_{1}:t_{2} is ____ ×10−1\times10^{- 1} (nearest integer). [Given: log⁡103=0.477\log_{10}3 = 0.477 and log⁡10(5)=0.699\log_{10}(5) = 0.699 ]