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Day 427: JEE Mains Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 22 Jan 2026 S2

    43
    The compound A, C8H8O2C_{8}H_{8}O_{2} reacts with acetophenone to form a single product via crossAldol condensation. The compound A on reaction with conc. NaOH forms a substituted benzyl alcohol as one of the products. Compound A is:

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  2. Question 2

    Amines. Asked once: 23 Jan 2026 S1

    43
    Compound ' P ' undergoes the following sequence of reactions :  ′P\ ^{'}P ' is :

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  3. Question 3

    Biomolecules. Asked once: 6 Apr 2024

    123
    The incorrect statements regarding enzymes are: (A) Enzymes are biocatalysts. (B) Enzymes are non-specific and can catalyse different kinds of reactions. (C) Most Enzymes are globular proteins. (D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose. Choose the correct answer from the option given below:

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  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 29 Jan 2025

    42
    An element ' EE ' has the ionisation enthalpy value of 374kJmol−1374kJmol^{- 1}. ' E ' reacts with elements A,B,CA,B,C and D with electron gain enthalpy values of −328,−349- 328, - 349, -325 and −295 kJ mol−1- 295\text{ }kJ{\text{ }mol}^{- 1}, respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is :

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  5. Question 5

    Chemical Kinetics. Asked once: 7 Apr 2025

    42
    A person's wound was exposed to some bacteria and then bacteria growth started to happen at the same place. The wound was later treated with some antibacterial medicine and the rate of bacterial decay (r) was found to be proportional with the square of the existing number of bacteria at any instance. Which of the following set of graphs correctly represents the 'before' and 'after' situation of the application of the medicine? [Given : N=N = No. of bacteria, t=t = time, bacterial growth follows Ist I^{\text{st~}} order kinetics.]

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