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Day 415: 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

    27
    The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below:-
    CH3−CH=CH−O−CH=CH2CH_{3}- CH = CH - O - CH =CH_{2}
    ↓H3O(+)\downarrow H_{3}O^{( + )}
    CH3−CH2−CH=O and O=CH−CH3CH_{3}-CH_{2}- CH = O\text{~and~}O = CH -CH_{3}
    Based on this, predict the solution / reagent that will help to distinguish "P" and "Q" obtained in the following reaction.

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  2. Question 2

    Amines. Asked once: 24 Jan 2026 S2

    40
    Given below are two statements : Statement I : The dipole moment of R-CN is greater than R−NCR - NC and R−NCR - NC can undergo hydrolysis under acidic medium to produce R−COOHR-COOH. Statement II : R-CN hydrolyses under acidic medium to produce a compound which on treatment with SOCl2{SOCl}_{2}, followed by the addition of NH3{NH}_{3} gives another compound(x). This compound (x) on treatment with NaOCl/NaOHNaOCl/NaOH gives a product, that on treatment with CHCl3/KOH/Δ{CHCl}_{3}/KOH/\Delta produces R-NC In the light of the above statements, choose the correct answer from the options given below :

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  3. Question 3

    Biomolecules. Asked once: 23 Jan 2025

    32
    Given below are two statements: Statement I: Fructose does not contain an aldehydic group but still reduces Tollen's reagent Statement II : In the presence of base, fructose undergoes rearrangement to give 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: 21 Jan 2026 S1

    39
    Given below are two statements: Statement I: The number of species among SF4{SF}_{4}, NH4+, [NiCl4]2−, XeF4, [PtCl4]2−, SeF4{NH}_{4}^{+},\ \left\lbrack {NiCl}_{4} \right\rbrack^{2 -},\ {XeF}_{4},\ \left\lbrack {PtCl}_{4} \right\rbrack^{2 -},\ {SeF}_{4} and [Ni(CN)4]2−\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}, that have tetrahedral geometry is 3 . Statement II: In the set [NO2,BeH2,BF3,AlCl3]\left\lbrack {NO}_{2},{BeH}_{2},{BF}_{3},{AlCl}_{3} \right\rbrack, all the molecules have incomplete octet around central atom. In the light of the above statements, choose the correct answer from the options given below:

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  5. Question 5

    Chemical Kinetics. Asked once: 23 Jan 2026 S2

    26
    Given above is the concentration vs time plot for a dissociation reaction : A→nBA \rightarrow nB. Based on the data of the initial phase of the reaction (initial 10 min ), the value of n is ____\_\_\_\_ .

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