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Day 56: JEE Mains Chemistry

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

  1. Question 1

    Biomolecules. This type asked 3 times: 29 Jun 2022, 24 Jan 2025, 23 Jan 2026 S2. This one: 23 Jan 2026 S2 See all 3 of this type

    29
    Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

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  2. Question 2

    Organic Chemistry - Some Basic Principles and Techniques. This type asked 3 times: 2021 Paper 17, 3 Apr 2025, 23 Jan 2026 S2. This one: 23 Jan 2026 S2 See all 3 of this type

    32
    Given below are two statements: Statement I: (CH3)3C⊕\left( {CH}_{3} \right)_{3}\overset{\oplus}{C} is more stable than C⊕H3\overset{\oplus}{C}H_{3} as nine hyperconjugation interactions are possible in (CH3)3C⊕\left( {CH}_{3} \right)_{3}\overset{\oplus}{C}. Statement II: C⊕H3\overset{\oplus}{C}H_{3} is less stable than (CH3)3C⊕\left( {CH}_{3} \right)_{3}\overset{\oplus}{C} as only three hyperconjugation interactions are possible in C⊕H3\overset{\oplus}{C}H_{3}. In the light of the above statements, choose the correct answer from the options given below.

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  3. Question 3

    Electrochemistry. This type asked 3 times: 24 Jan 2023, 1 Feb 2023, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 3 of this type

    46
    Consider the following electrochemical cell :
    Pt∣O2(g)(lbar)∣HCl(aq)∥M2+(aq,1.0M)∣M(s)Pt\left| O_{2}(g)(lbar) \right|HCl(aq)\| M^{2 +}(aq,1.0M) \mid M(s)
    The pH above which, oxygen gas would start to evolve at anode is ____\_\_\_\_ (nearest integer).
    [ Given :  EM2+/M0=0.994 VEO2/H2O0=1.23 V} standard reduction potential  and RTF(2.303)=0.059 V at the given condition ]\begin{bmatrix} \text{~Given :~} & \left. \ \begin{matrix} E_{M^{2 +}/M}^{0} = 0.994\text{ }V \\ E_{O_{2}/H_{2}O}^{0} = 1.23\text{ }V \end{matrix} \right\}\text{~standard reduction potential~} \\ & \text{~and~}\frac{RT}{F}(2.303) = 0.059\text{ }V\text{~at the given condition~} \end{bmatrix}

  4. Question 4

    Aldehydes, Ketones and Carboxylic Acids. This type asked 3 times: 2021 Paper 19, 1 Feb 2024, 22 Jan 2026 S1. This one: 22 Jan 2026 S1 See all 3 of this type

    38
    Match the LIST-I with LIST-II
    List-I ReagentsList-II Name of Reaction involving carbonyl compound
    (A)NH2−NH2, KOH{NH}_{2} - {NH}_{2},\ KOH(I)Tollen's Test
    (B)Ag(NH3)2OHAg\left( {NH}_{3} \right)_{2}OH(II)Clemmensen Reduction
    (C)Aq. CuSO4{CuSO}_{4}, sodium potassium tartrate, KOH(III)Wolff-Kishner Reduction
    (D)Zn−Hg, HClZn - Hg,\ HCl(IV)Fehling's Test
    Choose the correct answer from the options given below

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  5. Question 5

    Haloalkanes and Haloarenes. This type asked 3 times: 26 Jun 2022, 21 Jan 2026 S2, 22 Jan 2026 S1. This one: 22 Jan 2026 S1 See all 3 of this type

    34
    The correct order of reactivity of CH3BrCH_{3}Br in methanol with the following nucleophiles is F−,I−,C2H5O−F^{-},I^{-},C_{2}H_{5}O^{-}and C6H5O−C_{6}H_{5}O^{-}

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