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Day 435: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 7 Apr 2025

    105
    "P" is an optically active compound with molecular formula C6H12OC_{6}H_{12}O. When " P " is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, "P" gives a negative test. Predict the structure of "P".

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  2. Question 2

    Amines. Asked once: 22 Jan 2026 S1

    41
    'A' is a neutral organic compound (M. F : C8H9ONC_{8}H_{9}ON ). On treatment with aqueous Br2/HO(−)Br_{2}/HO^{( - )}, 'A' forms a compound ' B ' which is soluble in dilute acid. ' B ' on treatment with aqueous NaNO2/HCl(0−5∘C)NaNO_{2}/HCl\left( 0 -5^{\circ}C \right) produces a compound ' C ' which on treatment with CuCN/NaCNCuCN/NaCN produces 'D' Hydrolysis of 'D' produces ' E ' which is also obtainable from the hydrolysis of 'A'. 'E' on treatment with acidified KMnO4KMnO_{4} produces 'F'. 'F' contains two different types of hydrogen atoms. The structure of ' A ' is

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  3. Question 3

    Biomolecules. Asked once: 29 Jan 2024

    46
    Type of amino acids obtained by hydrolysis of proteins is:

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 24 Jan 2025

    43
    Which of the following statement is true with respect to H2O,NH3H_{2}O,NH_{3} and CH4CH_{4} ? (A) The central atoms of all the molecules are sp3sp^{3} hybridized. (B) The H−O−H,H−N−HH - O - H,H - N - H and H−C−HH - C - H angles in the above molecules are 104.5∘,107.5∘104.5^{\circ},107.5^{\circ} and 109.5∘109.5^{\circ} respectively. (C) The increasing order of dipole moment is CH4<NH3<H2OCH_{4}<NH_{3}<H_{2}O. (D) Both H2OH_{2}O and NH3NH_{3} are Lewis acids and CH4CH_{4} is a Lewis base (E) A solution of NH3NH_{3} in H2OH_{2}O is basic. In this solution NH3NH_{3} and H2OH_{2}O act as Lowry-Bronsted acid and base respectively. Choose the correct answer from the options given below :

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  5. Question 5

    Chemical Kinetics. Asked once: 2 Apr 2025

    50
    For the reaction A→A \rightarrow products, the plot of t1/2t_{1/2} against [A]0[A]_{0} is shown in the figure. The concentration of A at 10 minutes is ____×10−3 mol L−1\_\_\_\_ \times 10^{- 3}\text{ }mol{\text{ }L}^{- 1} (nearest integer). The reaction was started with 2.5 mol L−12.5\text{ }mol{\text{ }L}^{- 1} of A .