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Day 47: JEE Mains Chemistry

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

  1. Question 1

    Biomolecules. Asked 3 times: 2021 Paper 1, 2021 Paper 6, 28 Jun 2022 See all 3 times it was asked

    49
    Stability of α\alpha - Helix structure of proteins depends upon

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  2. Question 2

    Aldehydes, Ketones and Carboxylic Acids. This type asked 3 times: 23 Jan 2026 S1, 6 Apr 2026 S2, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 3 of this type

    47
    ' x ' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. ' y ' is the major product obtained from the benzene by reacting it with ethanoyl chloride in the presence of anhydrous AlCl3{AlCl}_{3}. Product (major) obtained by heating x and y in the presence of alkali is z . Total number of π\pi (pi) electrons in z is ____\_\_\_\_ .

  3. Question 3

    Equilibrium. This type asked 3 times: 2021 Paper 17, 2021 Paper 21, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 3 of this type

    50
    Solid carbon, CaO and CaCO3{CaCO}_{3} are mixed and allowed to attain equilibrium at T K .
    CaCO3(s)⇌CaO(s)+CO2(g),Kp1=0.08 atm{CaCO}_{3}(s) \rightleftharpoons CaO(s) + {CO}_{2}(g),\quad K_{p_{1}} = 0.08\text{ atm}
    C(s)+CO2(g)⇌2CO(g),Kp2=2 atmC(s) + {CO}_{2}(g) \rightleftharpoons 2CO(g),\quad K_{p_{2}} = 2\text{ atm}
    The partial pressure of CO is ____\_\_\_\_ ×10−1 atm\times 10^{- 1}\text{ }atm.

  4. Question 4

    Haloalkanes and Haloarenes. This type asked 3 times: 29 Jan 2023, 31 Jan 2023, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 3 of this type

    41
    Given below are two statements : Statement-I : Due to increase in van der Waals forces, the order of boiling points is CH3CH2CH2I>CH3CH2I>CH3I{CH}_{3}{CH}_{2}{CH}_{2}I > {CH}_{3}{CH}_{2}I > {CH}_{3}I. Statement-II : As p-dichlorobenzene (1,4-dichlorobenzene) is more symmetric, its melting point is higher than that of o-dichlorobenzene (1,2-dichlorobenzene); however, its boiling point is lower than that of o-dichlorobenzene. In the light of the above statements, choose the correct answer from the options given below :

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  5. Question 5

    Structure of Atom. This type asked 3 times: 8 Apr 2024, 28 Jan 2026 S2, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 3 of this type

    48
    Consider two radiations of wavelengths : 1. λ1=2000Å\lambda_{1} = 2000\text{Å} 2. λ2=6000Å\lambda_{2} = 6000\text{Å} The ratio of the energies of these two radiations (E1E2)\left( \frac{E_{1}}{E_{2}} \right) is ____\_\_\_\_ . (Nearest integer)