Question

An organic compound '$\mathrm{A}$' $\left({\mathrm{C}}_9{\mathrm{H}}_{10}\mathrm{O}\right)$ when treated with conc. $\mathrm{HI}$ undergoes cleavage to yield compound '$\mathrm{B}$' and '$\mathrm{C}$'. '$\mathrm{B}$' gives yellow precipitate with ${\text{AgNO}}_3$ where as '$\mathrm{C}$' tautomerizes to '$\mathrm{D}$'. '$\mathrm{D}$' gives positive iodoform test. '$\mathrm{A}$' could be:

JEE Main 2020 (02 Sep Shift 2)

Options

• A:
• B:
• C:
• D:

Question

In the following reaction sequence the major products $\mathrm{A}$ and $\mathrm{B}$ are :

JEE Main 2020 (05 Sep Shift 1)

Options

• A:
• B:
• C:
• D:

Question

The final major product of the following reaction is :

JEE Main 2020 (05 Sep Shift 2)

Options

• A:
• B:
• C:
• D:

Question

Consider the following reactions:

'A' is

JEE Main 2020 (06 Sep Shift 1)

Options

• A:   
• B:   
• C:   
• D:   

Question

The major products of the following reaction are :

JEE Main 2020 (06 Sep Shift 1)

Options

• A:   
• B:   
• C:   
• D:   

Question

An unsaturated hydrocarbon $X$ absorbs two hydrogen molecules on catalytic hydrogenation, and also gives following reaction:
$\mathrm{X}\stackrel{\left(\mathrm{i}\right){\mathrm{O}}_3}{\underset{\frac{\left(\mathrm{ii}\right)\mathrm{Zn}}{{\mathrm{H}}_2\mathrm{O}}}{\to }}\mathrm{A}\stackrel{{\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]}^{+}}{\to }\mathrm{B}$  (3-oxo-hexanedicarboxylic acid) $X$ will be:

JEE Main 2020 (08 Jan Shift 2)

Options

• A:
• B:
• C:
• D:

Question

The correct order of heat of combustion for following alkadienes is:

JEE Main 2020 (09 Jan Shift 1)

Options

• A: $\left(\mathrm{a}\right)<\left(\mathrm{b}\right)<\left(\mathrm{c}\right)$
• B: $\left(\mathrm{a}\right)<\left(\mathrm{c}\right)<\left(\mathrm{b}\right)$
• C: $\left(\mathrm{c}\right)<\left(\mathrm{b}\right)<\left(\mathrm{a}\right)$
• D: $\left(\mathrm{b}\right)<\left(\mathrm{c}\right)<\left(\mathrm{a}\right)$

Question

In the following sequence of reactions, ${\mathrm{C}}_3{\mathrm{H}}_6\stackrel{{\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}}{⟶}\mathrm{A}\frac{\mathrm{KIO}}{\mathrm{dilKOH}}\mathrm{B}+\mathrm{C}$.  The compounds $\mathrm{B}$ and $\mathrm{C}$ respectively are :

JEE Main 2021 (01 Sep Shift 2)

Options

• A: ${\mathrm{CI}}_3\mathrm{COOK}, {\mathrm{CH}}_3\mathrm{I}$
• B: ${\mathrm{CH}}_3\mathrm{I}, \mathrm{HCOOK}$
• C: ${\mathrm{CI}}_3\mathrm{COOK}, \mathrm{HCOOH}$
• D: ${\mathrm{CHI}}_3, {\mathrm{CH}}_3\mathrm{COOK}$

Question

An unsaturated hydrocarbon $\mathrm{X}$ on ozonolysis gives $\mathrm{A}$. Compound $\mathrm{A}$ when warmed with ammoniacal silver nitrate forms a bright silver mirror along the sides of the test tube. The unsaturated hydrocarbon $\mathrm{X}$ is :

JEE Main 2021 (16 Mar Shift 2)

Options

• A:
• B:
• C: $\mathrm{HC}\equiv \mathrm{C}-{\mathrm{CH}}_2-{\mathrm{CH}}_3$
• D: ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_3$

Question

Identify products $\mathrm{A}$ and $\mathrm{B}.$

JEE Main 2021 (24 Feb Shift 1)

Options

• A:
• B:
• C:
• D:

Question

Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ followed by treatment with $\mathrm{NaOH}$?

JEE Main 2021 (24 Feb Shift 1)

Options

• A:
• B:
• C:
• D:

Question

Among the following compounds $\mathrm{I}-\mathrm{IV},$ which one forms a yellow precipitate on reacting sequentially with (i) $\mathrm{NaOH}$ (ii) dil. ${\mathrm{HNO}}_3$ (iii) ${\mathrm{AgNO}}_3?$

JEE Main 2021 (26 Aug Shift 1)

Options

• A: $\mathrm{III}$
• B: $\mathrm{II}$
• C: $\mathrm{I}$
• D: $\mathrm{IV}$

Question

Consider the following chemical reaction.
$\mathrm{CH}\equiv \mathrm{CH}\frac{ 1) \mathrm{Red} \mathrm{hot} \mathrm{Fe} \mathrm{tube}, 873 \mathrm{K}}{ 2) \mathrm{CO},\mathrm{HCl},{\mathrm{AlCl}}_3}> \mathrm{Product}$
The number of ${\mathrm{sp}}^2$ hybridized carbon atom(s) present in the product is

JEE Main 2021 (25 Feb Shift 1)

Enter your answer

Question

A compound '$\mathrm{A}$' on reaction with '$\mathrm{X}$' and '$\mathrm{Y}$ produces the same major product but different by product '$\mathrm{a}$' and '$\mathrm{b}$'. Oxidation of '$\mathrm{a}$' gives a substance produced by ants.

​​​​​​​

'$\mathrm{X}$' and '$\mathrm{Y}$' respectively are

JEE Main 2022 (25 Jul Shift 1)

Options

• A: ${\mathrm{KMnO}}_4/{\mathrm{H}}^{+}$and dil. ${\mathrm{KMnO}}_4,273 \mathrm{K}$
• B: ${\mathrm{KMnO}}_4$,(dilute), $273 \mathrm{K}$ and ${\mathrm{KMnO}}_4/{\mathrm{H}}^{+}$
• C: ${\mathrm{KMnO}}_4/{\mathrm{H}}^{+}$ and ${\mathrm{O}}_3,{\mathrm{H}}_2\mathrm{O}/\mathrm{Zn}$
• D: ${\mathrm{O}}_3,{\mathrm{H}}_2\mathrm{O}/\mathrm{Zn}$ and ${\mathrm{KMnO}}_4/{\mathrm{H}}^{+}$

Question

What will be the major product of following sequence of reactions?

JEE Main 2022 (27 Jun Shift 2)

Options

• A:
• B:
• C:
• D:

Question

Choose the correct option for the following reactions.

JEE Main 2022 (28 Jul Shift 1)

Options

• A: '$\mathrm{A}$' and '$\mathrm{B}$' are both Markovnikov addition products.
• B: '$\mathrm{A}$' is Markovnikov product and '$\mathrm{B}$' is antiMarkovnikov product.
• C: '$\mathrm{A}$' and '$\mathrm{B}$' are both anti-Markovnikov products.
• D: '$\mathrm{B}$' is Markovnikov and '$\mathrm{A}$' is anti-
  Markovnikov product.

Question

The total number of monobromo derivatives formed by the alkanes with molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{12}$ is (excluding stereo isomers)

JEE Main 2022 (25 Jul Shift 2)

Enter your answer

Question

In bromination of Propyne, with Bromine $1,1,2,2$-tetrabromopropane is obtained in $27\%$ yield. The amount of $1,1,2,2$ tetrabromopropane obtained from $1 \mathrm{g}$ of Bromine in this reaction is_____$\times {10}^{-1} \mathrm{g}$ . (Molar Mass : Bromine $=80 \mathrm{g}/\mathrm{mol}$)

JEE Main 2022 (29 Jul Shift 1)

Enter your answer

Question

Identify the correct statement for the below given transformation.

JEE Main 2022 (28 Jul Shift 1)

Options

• A:

  $\mathrm{A}-{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3,$

  $\mathrm{B}-{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CH}}_2,$ Saytzeff products

• B:

  $\mathrm{A}-{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3,$

  $\mathrm{B}-{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CH}}_2,$
  Hafmann products

• C:

  $\mathrm{A}-{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CH}}_2,$

  $\mathrm{B}-{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CHCH}}_3,$
  Hofmann products

• D:

  $\mathrm{A}-{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CH}}_2,$

  $\mathrm{B}-{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CHCH}}_3,$
  Saytzeff products

Question

But-$2$-yne is reacted separately with one mole of Hydrogen as shown below:

$\underset{¯}{\mathrm{B}}\underset{\mathrm{liq} {\mathrm{NH}}_3}{\overset{\mathrm{Na}}{\leftarrow }}{\mathrm{CH}}_3-\underset{+{\mathrm{H}}_2}{\mathrm{C}\equiv }\mathrm{C}-{\mathrm{CH}}_3\underset{∆}{\overset{\mathrm{Pd}/\mathrm{C}}{\to }}\underset{¯}{\mathrm{A}}$

Identify the incorrect statements from the options given below:

A. A is more soluble than $\mathrm{B}$.
B. The boiling point & melting point of $\mathrm{A}$are higher and lower than $\mathrm{B}$ respectively.

C. A is more polar than $\mathrm{B}$ because dipole moment of $\mathrm{A}$ is zero.
D. ${\mathrm{Br}}_2$ adds easily to $\mathrm{B}$ than $\mathrm{A}$.

JEE Main 2023 (01 Feb Shift 1)

Options

• A: B and C only
• B: B, C and D only
• C: A, C and D only
• D: A and B only

Question

A hydrocarbon 'X' with formula ${\mathrm{C}}_6{\mathrm{H}}_8$ uses two moles of ${\mathrm{H}}_2$ on catalystic hydrogenation of its one mole. On ozonolysis, 'X' yields two moles of methane dicarbaldehyde. The hydrocarbon 'X' is :

JEE Main 2023 (31 Jan Shift 2)

Options

• A: hexa-$1, 3, 5$-triene
• B: $1$-methylcyclopenta-$1$, $4-$diene
• C: cyclohexa$-1$, $3-$diene
• D: cyclohexa$-1$,$4-$diene

Question

The major product '$\mathrm{P}$' formed in the given reaction is

JEE Main 2023 (10 Apr Shift 1)

Options

• A:

  

   

• B:

  

   

• C:

  

   

• D:

  

   

Question

Given below are two statements, one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$.
Assertion $\mathbf{A}$: can be subjected to Wolff-Kishner reduction to give 
Reason $\mathbf{R}$: Wolff-Kishner reduction is used to convert  into 
In the light of the above statements, choose the correct answer from the options given below:

JEE Main 2023 (11 Apr Shift 2)

Options

• A: $\mathbf{A}$ is true but $\mathbf{R}$ is false
• B: $\mathbf{A}$ is false but $\mathbf{R}$ is true
• C: Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$
• D: Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

Question

The major product formed in the following reaction is

A. 
B. 
C. 
D. 
choose the correct answer from the options Given below:

JEE Main 2023 (11 Apr Shift 2)

Options

• A: B only
• B: A only
• C: C only
• D: D only

Question

The product formed in the following multistep reaction is:

JEE Main 2023 (15 Apr Shift 1)

Options

• A:

  

• B:

  

• C:

  

• D: