PYQ Vault
EbooksTutor

Day 259: JEE Mains Chemistry

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

  1. Question 1

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 2021 Paper 17 (same type asked 3 times) See all 3 of this type

    37
    Given below are two statements: Statement I: Hyperconjugation is a permanent effect. Statement II: Hyperconjugation in ethyl cation (CH3−C+H2)\left( CH_{3}-\overset{+}{C}H_{2} \right) involves the overlapping of Csp 2−H1 sC_{sp}\ ^{2}-H_{1\text{ }s} bond with empty 2p2p orbital of other carbon. Choose the correct option:

    Tap an option to check your answer.

  2. Question 2

    Electrochemistry. Asked once: 24 Jan 2023 (same type asked 3 times) See all 3 of this type

    60
    At 298 K298\text{ }K, a 1 litre solution containing 10mmol10mmol of Cr2O72−Cr_{2}O_{7}^{2 -} and 100mmol100mmol of Cr3+Cr^{3 +} shows a pH of 3.0. Given: Cr2O72−→Cr3+;E∘=1.330 VCr_{2}O_{7}^{2 -}\rightarrow Cr^{3 +};E^{\circ}= 1.330\text{ }V and 2.303RTF=0.059 V\frac{2.303RT}{F}= 0.059\text{ }V The potential for the half cell reaction is x×10−3 Vx\times10^{- 3}\text{ }V. The value of xx is ____\_\_\_\_.

  3. Question 3

    Aldehydes, Ketones and Carboxylic Acids. Asked once: 2021 Paper 19 (same type asked 3 times) See all 3 of this type

    37
    Match List-I with List-II: List-I (Chemical Reaction) List-II (Reagent used) (a) CH3COOCH2CH3→CH3CH2OHCH_{3}COOCH_{2}CH_{3}\rightarrow CH_{3}CH_{2}OH (i) CH3MgBr/H3O+CH_{3}MgBr/H_{3}O^{+} (1 equivalent) (b) CH3COOCH3→CH3CHOCH_{3}COOCH_{3}\rightarrow CH_{3}CHO (ii) H2SO4/H2OH_{2}SO_{4}/H_{2}O (c) CH3C≡N→CH3CHOCH_{3}C \equiv N \rightarrow CH_{3}CHO (iii) DIBAL-H/ H2OH_{2}O (d) CH3C≡N→CH3COCH3CH_{3}C \equiv N \rightarrow CH_{3}COCH_{3} (iv) SnCl2,HCl/H2OSnCl_{2},HCl/H_{2}O Choose the most appropriate match:

    Tap an option to check your answer.

  4. Question 4

    Haloalkanes and Haloarenes. Asked once: 26 Jun 2022 (same type asked 3 times) See all 3 of this type

    131
    The correct order of nucleophilicity is

    Tap an option to check your answer.

  5. Question 5

    Hydrocarbons. Asked once: 26 Jun 2022 (same type asked 3 times) See all 3 of this type

    134
    Halogenation of which one of the following will yield m-substituted product with respect to methyl group as a major product?

    Tap an option to check your answer.