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Day 411: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 24 Jan 2026 S2

    50
    Grignard reagent RMgBr(P)RMgBr(P) reacts with water and forms a gas (Q). One gram of Q occupies 1.4dm31.4{dm}^{3} at STP. (P) on reaction with dry ice in dry ether followed by H3O+H_{3}O^{+}forms a compound (Z). 0.1 mole of (Z) will weigh ____\_\_\_\_ g. (Nearest integer)

  2. Question 2

    Amines. Asked once: 28 Jan 2026 S1

    38
    Consider the following reactions giving major product. Identify the correct reaction.

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  3. Question 3

    Biomolecules. Asked once: 28 Jan 2025

    45
    Given below are two statements : Statement I : D-glucose pentaacetate reacts with 2, 4-dinitrophenylhydrazine. Statement II : Starch, on heating with concentrated sulfuric acid at 100∘C100^{\circ}C and 2−32 - 3 atmosphere pressure produces glucose. In the light of the above statements, choose the correct answer from the options given below

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 22 Jan 2026 S1

    43
    Two p-block elements X and Y form fluorides of the type EF3EF_{3}. The fluoride compound XF3XF_{3} is a Lewis acid and YF3YF_{3} is a Lewis base. The hybridization of the central atoms of XF3XF_{3} and YF3YF_{3} respectively are

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  5. Question 5

    Chemical Kinetics. Asked once: 28 Jan 2026 S2

    47
    A→BA \rightarrow B (first reaction) C→DC \rightarrow D (second reaction) Consider the above two first-order reactions. The rate constant for first reaction at 500 K is double of the same at 300 K At 500 K,50%500\text{ }K,50\% of the reaction becomes complete in 2 hour. The activation energy of the second reaction is half of that of first reaction. If the rate constant at 500 K of the second reaction becomes double of the rate constant of first reaction at the same temperature; then rate constant for the second reaction at 300 K is .......... ×10−1\times 10^{- 1} hour  −1\ ^{- 1} (nearest integer).