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Day 463: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 9 Apr 2024

    46
    Identify major product "X" formed in the following reaction:

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  2. Question 2

    Amines. Asked once: 23 Jan 2025

    122
    Consider the following sequence of reactions. →(i)NaNO2,HCl0−5∘C(A)\overset{\begin{array}{r} \left( i \right)NaNO_{2},HCl \\ \mathbf{0 - 5{^\circ}C} \end{array}}{\rightarrow}(A) Total number of sp3sp^{3} hybridised carbon atoms in the major product C formed is ____\_\_\_\_

  3. Question 3

    Biomolecules. Asked once: 1 Feb 2023

    122
    All structures given below are of vitamin C. Most stable of them is:

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 1 Feb 2023

    33
    Resonance in carbonate ion (CO32−)\left( CO_{3}^{2 -} \right) is Which of the following is true?

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  5. Question 5

    Chemical Kinetics. Asked once: 22 Jan 2025

    49
    A→ BA \rightarrow\text{ }B The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of 1000 K . If the energy barrier with respect to reactant energy for such isomeric transformation is 191.48 kJ mol−1191.48\text{ }kJ{\text{ }mol}^{- 1} and the frequency factor is 102010^{20}, the time required for 50%50\%, molecules of A to become BB is ______\_\_\_\_\_\_ picoseconds (nearest integer).
    [R=8.314 J K−1 mol−1]\left\lbrack R = 8.314\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} \right\rbrack