PYQ Vault

Day 403: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 28 Jan 2026 S2

    40
    The correct order of acidic strength of the major products formed in the given reactions, is : (A) PhNH2→(1)NaNO2+HCl(<5∘C)(2)CuCN, (3)H3O+/Δ[A]{PhNH}_{2}\underset{(2)CuCN,\ (3)H_{3}O^{+}/\mathrm{\Delta}}{\overset{(1){NaNO}_{2} + HCl\left( < 5^{\circ}C \right)}{\rightarrow}}\lbrack A\rbrack (B) CH3CH2CHO→[Ag(NH3)2]+.OH− Δ {CH}_{3}{CH}_{2}CHO\underset{\Delta\ }{\overset{\left\lbrack Ag\left( {NH}_{3} \right)_{2} \right\rbrack^{+}.{OH}^{-}\ }{\rightarrow}}[B] (C) CH4+O2→(i) Mo2O3  (ii) Na2Cr2O7/H+ [C]{CH}_{4} + O_{2}\underset{\text{~(ii)~}{Na}_{2}{Cr}_{2}O_{7}/H^{+}\ }{\overset{\text{(i)~}{Mo}_{2}O_{3}\ }{\rightarrow}}\lbrack C\rbrack (D) PhCH2MgBr+CO2→Dry ether  H3O+ [D]{PhCH}_{2}MgBr + {CO}_{2}\underset{H_{3}O^{+}\ }{\overset{\text{Dry ether~}\ }{\rightarrow}}\lbrack D\rbrack Choose the correct answer from the options given below:

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  2. Question 2

    Amines. Asked once: 2 Apr 2026 S1

    41
    For the given molecule, "x", the preferred site for the attack of the electrophile is :

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  3. Question 3

    Biomolecules. Asked once: 4 Apr 2025

    39
    Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 23 Jan 2026 S1

    40
    Identify the molecule (X)(X) with maximum number of lone pairs of electrons (obtained using Lewis dot structure) among HNO3,H2SO4,NF3HNO_{3},H_{2}SO_{4},NF_{3} and O3O_{3}. Choose the correct bond angle made by the central atom of the molecule (X).

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  5. Question 5

    Chemical Kinetics. Asked once: 2 Apr 2026 S2

    47
    Consider the following gas phase reaction being carried out in a closed vessel at 25∘C25^{\circ}C.
    2 A( g)→4 B( g)+C( g)2\text{ }A(\text{ }g) \rightarrow 4\text{ }B(\text{ }g) + C(\text{ }g)
    The pressure of C(g)C(g) at 30 minutes time interval would be ____\_\_\_\_ mm Hg. (Nearest integer)