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Day 399: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 2 Apr 2026 S2

    42
    A molecule ( X ) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements about (Y) and (Z). (A) Both (Y) and (Z) have same molar mass (B) (Y) and (Z) can be distinguished from each other by NaHCO3{NaHCO}_{3} (C) (Y) and (Z) react with HCN with same rates (D) (Y) and (Z) undergo addition reaction with 2, 4-DNP Choose the correct answer from the options given below :

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  2. Question 2

    Amines. Asked once: 2 Apr 2026 S1

    43
    Consider the three aromatic molecules (P, Q and R) whose structures have been given below : The correct order regarding the reactivity of these compounds with Ph−N+≡N Cl−Ph - \overset{+}{N} \equiv N\ Cl^{-} under optimum, slightly acidic conditions is :

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  3. Question 3

    Biomolecules. Asked once: 4 Apr 2025

    104
    A dipeptide, "x" on complete hydrolysis gives "y" and " zz ". " yy " on treatment with aq. HNO2HNO_{2} produces lactic acid. On the other hand " zz " on heating gives the following cyclic molecule. Based on the information given, the dipeptide X is:

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 23 Jan 2026 S2

    38
    Which statements are NOT TRUE about XeO2 F2XeO_{2}{\text{ }F}_{2} ? (A) It has a see-saw shape. (B) Xe has 5 electron pairs in its valence shell in XeO2 F2{XeO}_{2}{\text{ }F}_{2}. (C) The O−Xe−OO - Xe - O bond angle is close to 180∘180^{\circ}. (D) The F−Xe−FF - Xe - F bond angle is close to 180∘180^{\circ} (E) Xe has 16 valence electrons in XeO2 F2{XeO}_{2}{\text{ }F}_{2}. Choose the correct answer from the options given below.

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  5. Question 5

    Chemical Kinetics. Asked once: 2 Apr 2026 S2

    32
    Consider the reaction aX→bYaX \rightarrow bY, for which the rate constant at 30∘C30^{\circ}C is 1×10−3 mol−1Ls−11 \times10^{- 3}{\text{ }mol}^{- 1}Ls^{- 1}. Which of the following statements are true ? (A) When concentration of ' X ' is increased to four times, the rate of reaction becomes 16 times. (B) The reaction is a second order reaction. (C) The half-life period is independent of the concentration of X . (D) Decomposition of N2O5N_{2}O_{5} is an example of the above reaction. (E) The plot shown in the figure is valid for the above reaction. Choose the correct answer from the options given below :

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