Question

'$\mathrm{A}$' and '$\mathrm{B}$' respectively are

A. $\underset{\left(2\right)\mathrm{Zn}-{\mathrm{H}}_2\mathrm{O}}{\overset{\left(1\right){\mathrm{O}}_3}{\to }}$ Ethane-$1,2$-dicarbaldehyde $+$Glyoxal/Oxaldehyde

B $\underset{\left(2\right)\mathrm{Zn}-{\mathrm{H}}_2\mathrm{O}}{\overset{\left(1\right){\mathrm{O}}_3}{\to }} 5-$ -oxohexanal

JEE Main 2022 (27 Jun Shift 1)

Options

• A: $1$-methylcyclohex-$1,3$-diene & cyclopentene.
• B: Cyclohex-$1,3$-diene & cyclopentene
• C: Cyclohex-$1,3$-diene & $1$-methylcyclopent-$1$-ene
• D: $1$-methylcyclohex- $1,4$-diene & $1$-methylcyclopent-$1$-ene

Question

$\mathrm{D}-(+)-$Glyceraldehyde$\underset{\underset{\mathrm{iii}){\mathrm{HNO}}_3}{\mathrm{ii}){\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}}}{\overset{\mathrm{i})\mathrm{HCN}}{\to }}$

The products formed in the above reaction are

JEE Main 2023 (13 Apr Shift 1)

Options

• A:

  One optically active and one meso product

• B: Two optically inactive products
• C:

  Two optically active products

• D:

  One optically inactive and one meso product

Question

Which of the following reagent is suitable for the preparation of the product in the above reaction?

JEE Main 2021 (24 Feb Shift 2)

Options

• A: Red $\mathrm{P}+{\mathrm{Cl}}_2$
• B: ${\mathrm{NaBH}}_4$
• C: ${\mathrm{NH}}_2-{\mathrm{NH}}_2/{\mathrm{C}}_2{\mathrm{H}}_5\stackrel{⊝}{\mathrm{O}}\stackrel{\oplus }{\mathrm{N}}\mathrm{a}$
• D: $\mathrm{Ni}/{\mathrm{H}}_2$

Question

${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CN}\underset{\mathrm{Ether}}{\overset{{\mathrm{CH}}_3\mathrm{MgBr}}{\to }}\mathrm{A}\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }\mathrm{B}\underset{\mathrm{HCl}}{\overset{\mathrm{Zn}-\mathrm{Hg}}{\to }}\mathrm{C}$. The correct structure of $\mathrm{C}$ is

JEE Main 2022 (25 Jul Shift 2)

Options

• A:
• B:

  

• C:

  

• D: ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CH}={\mathrm{CH}}_2$

Question

Which of the following conditions or reaction sequence will NOT give acetophenone as the major product?

JEE Main 2022 (25 Jun Shift 2)

Options

• A:

  (a)

  

  (b) ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7,{\mathrm{H}}^{+}$

• B:

  (a)

  

  (b) $\mathrm{PCC},\mathrm{DCM}$

• C:
• D:

Question

$\mathrm{A}$ in the above reaction is :

JEE Main 2023 (12 Apr Shift 1)

Options

• A:

  

• B:

  

• C:

  

• D:

  

Question

The structure of the starting compound $\mathrm{P}$ used in the reaction given below is:

JEE Main 2021 (27 Aug Shift 1)

Options

• A:
• B:
• C:
• D:

Question

Identify $\left(\mathrm{A}\right)$ in the following reaction sequence:

JEE Main 2020 (09 Jan Shift 1)

Options

• A:
• B:
• C:
• D:

Question

‘A’ and ‘B’ in the above reactions are:

JEE Main 2023 (11 Apr Shift 1)

Options

• A:

  

• B:

  

• C:

  

• D:

  

Question

In the given reaction

(Where Et is $-{\mathrm{C}}_2{\mathrm{H}}_5$)

The number of chiral carbon/s in product $\mathrm{A}$ is

JEE Main 2022 (25 Jul Shift 1)

Enter your answer

Question

Compound $\left(\mathrm{X}\right)$ undergoes following sequence of reactions to give the Lactone $\left(\mathrm{Y}\right)$.

JEE Main 2023 (24 Jan Shift 1)

Options

• A:
• B:
• C:
• D:

Question

The ratio x/y on completion of the above reaction is ______ .

JEE Main 2023 (11 Apr Shift 1)

Enter your answer

Question

The products formed in the following reaction, $\mathrm{A}$ and $\mathrm{B}$ are

​​​​​​​

JEE Main 2022 (26 Jul Shift 1)

Options

• A:

  

• B:

  

• C:

  

• D:

  

Question

'$\mathrm{R}$' formed in the following sequence of reaction is:

JEE Main 2023 (24 Jan Shift 1)

Options

• A:
• B:
• C:
• D:

Question

The major aromatic product $\mathrm{C}$ in the following reaction sequence will be :

JEE Main 2020 (02 Sep Shift 1)

Options

• A:
• B:
• C:  
• D:  

Question

What is the product of following reaction?
?

JEE Main 2020 (07 Jan Shift 1)

Options

• A:
• B:
• C:
• D: