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Day 445: JEE Mains Chemistry

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

  1. Question 1

    Haloalkanes and Haloarenes. Asked once: 24 Jan 2025

    44
    Given below are two statements : Statement-I : The conversion proceeds well in the less polar medium. CH3−CH2−CH2−CH2−Cl⟶HO−CH3−CH2−CH2−CH2−OH+Cl−CH_{3}-CH_{2}-CH_{2}-CH_{2}-Cl \overset{HO^{-}}{\longrightarrow} CH_{3}-CH_{2}-CH_{2}-CH_{2}-OH + Cl^{-} Statement-II : The conversion proceeds well in the more polar medium. CH3−CH2−CH2−CH2−Cl⟶R3NCH3−CH2−CH2−CH2−N+R3 Cl−CH_{3}-CH_{2}-CH_{2}-CH_{2}-Cl \overset{R_{3}N}{\longrightarrow} CH_{3}-CH_{2}-CH_{2}-CH_{2}-\overset{+}{N}R_{3}\ Cl^{-} In the light of the above statements, choose the correct answer from the options given below.

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  2. Question 2

    Hydrocarbons. Asked once: 22 Jan 2026 S1

    46
    The cycloalkane (X) on bromination consumes one mole of bromine per mole of (X) and gives the product (Y) in which C:BrC:Br ratio is 3:13:1. The percentage of bromine in the product (Y) is ____\_\_\_\_ %. (Nearest integer) (Given : Molar mass in gmol−1H:1,C:12g{mol}^{- 1}H:1,C:12, O:16,Br:80O:16,Br:80 )

  3. Question 3

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 4 Apr 2025

    43
    Given below are two statements. Statement I : The dipole moment of CH3−CH=CH−CHO\mathrm{CH_{3}-CH=CH-CHO} is greater than that of CH3−CH2−CH2−CHO\mathrm{CH_{3}-CH_{2}-CH_{2}-CHO}. Statement II : The C1−C2\mathrm{C_{1}-C_{2}} bond length of CH3−CH=CH−CHO\mathrm{CH_{3}-CH=CH-CHO} is greater than the C1−C2\mathrm{C_{1}-C_{2}} bond length of CH3−CH2−CH2−CHO\mathrm{CH_{3}-CH_{2}-CH_{2}-CHO}. In the light of the above statements, choose the correct answer from the options given below:

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  4. Question 4

    Organic Reaction Mechanisms. Asked once: 13 Apr 2023

    130
    The major product for the following reaction is:

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  5. Question 5

    Solutions. Asked once: 6 Apr 2024

    143
    When ' xx ' ×10−2 mL\times10^{- 2}\text{ }mL methanol (molar mass =32 g= 32\text{ }g; density =0.792 g/cm3= 0.792\text{ }g/cm^{3} ) is added to 100 mL100\text{ }mL water (density =1 g/cm3= 1\text{ }g/cm^{3} ), the following diagram is obtained. x=x = ________ (nearest integer) [Given: Molal freezing point depression constant of water at 273.15 Kis 1.86 K kg mol−1273.15{\text{ }K}^{\text{is~}}1.86\text{ }K\text{ }kg{\text{ }mol}^{- 1} ]