Question

Consider the following reactions :

(i) Glucose $+\mathrm{ROH}\stackrel{\mathrm{dry}\mathrm{HCI}}{\to }\mathrm{Acetal}\underset{{\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2}{\overset{\mathrm{x}\mathrm{eq}.\mathrm{of}}{\to }}$ acetyl derivative

(ii) Glucose $\stackrel{\mathrm{Ni}/{\mathrm{H}}_2}{\to }\mathrm{A}\underset{{\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2\mathrm{O}}{\overset{\mathrm{y}\mathrm{eq}.\mathrm{of}}{\to }}$ acetyl derivative

(iii) Glucose $\underset{{\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2\mathrm{O}}{\overset{\mathrm{z}\mathrm{eq}.\mathrm{of}}{\to }}$ acetyl derivative '$\mathrm{x}$' , '$\mathrm{y}$' and '$\mathrm{z}$' in these reactions are respectively.

JEE Main 2020 (02 Sep Shift 1)

Options

• A: $5,4$ & $6$
• B: $4, 6$ & $5$
• C: $4, 5$ & $5$
• D: $5, 6$ & $5$

Question

 The correct observation in the following reaction is:

$\mathrm{Sucrose}\underset{\mathrm{Cleavage} \left(\mathrm{Hydrolysis}\right)}{\overset{\mathrm{Gly} \mathrm{cosidic} \mathrm{bond}}{\to }}\mathrm{A}+\mathrm{B}\underset{\mathrm{Reagent}}{\overset{\mathrm{Seliw} \mathrm{anoff}}{\to }}?$

JEE Main 2020 (02 Sep Shift 2)

Options

• A:  Formation of blue colour
• B:  Gives no colour
• C:  Formation of red colour
• D:  Formation of violet colour

Question

The number of chiral centres present in threonine is _________

JEE Main 2020 (04 Sep Shift 2)

Enter your answer

Question

The correct structure of Ruhemann's Purple, the compound formed in the reaction of Ninhydrin with proteins is:

JEE Main 2021 (20 Jul Shift 1)

Options

• A:
• B:
• C:
• D:

Question

Which of the following is correct structure of $\alpha$-anomer of maltose?

JEE Main 2021 (25 Feb Shift 2)

Options

• A:
• B:
• C:
• D:

Question

Hydrolysis of sucrose gives:

JEE Main 2021 (27 Aug Shift 2)

Options

• A: $\alpha -\mathrm{D}-(+)-$ Glucose and $\alpha -\mathrm{D}-(-)$-Fructose
• B: $\alpha -\mathrm{D}-(+)-$ Glucose and $\beta -\mathrm{D}-(-)-$Fructose
• C: $\alpha -\mathrm{D}-(-)$-Glucose and $\beta -\mathrm{D}-(-)$-Fructose
• D: $\alpha -\mathrm{D}-(-)-\mathrm{Glucose}$ and $\alpha -\mathrm{D}-(+)$-Fructose

Question

Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is :

JEE Main 2021 (27 Jul Shift 2)

Options

• A: Amylose
• B: Sucrose
• C: Maltose
• D: Lactose

Question

A polysaccharide '$\mathrm{X}$' on boiling with dil ${\mathrm{H}}_2{\mathrm{SO}}_4$ at $393 \mathrm{K}$ under $2-3 \mathrm{atm}$ pressure yields '$\mathrm{Y}$' '$\mathrm{Y}$' on treatment with bromine water gives gluconic acid. '$\mathrm{X}$' contains $\mathrm{\beta }$-glycosidic linkages only. Compound '$\mathrm{X}$' is :

JEE Main 2022 (24 Jun Shift 1)

Options

• A: starch
• B: cellulose
• C: amylose
• D: amylopectin

Question

The formulas of $\mathrm{A}$ and $\mathrm{B}$ for the following reaction sequence are

JEE Main 2022 (28 Jul Shift 2)

Options

• A: $\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{14}{\mathrm{O}}_8,\mathrm{B}={\mathrm{C}}_6{\mathrm{H}}_{14}$
• B: $\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{13}{\mathrm{O}}_7,\mathrm{B}={\mathrm{C}}_7{\mathrm{H}}_{14}\mathrm{O}$
• C: $\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{12}{\mathrm{O}}_8,\mathrm{B}={\mathrm{C}}_6{\mathrm{H}}_{14}$
• D: $\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{14}{\mathrm{O}}_8,\mathrm{B}={\mathrm{C}}_6{\mathrm{H}}_{14}{\mathrm{O}}_6$

Question

All structures given below are of vitamin $\mathrm{C}$. Most stable of them is:

JEE Main 2023 (01 Feb Shift 2)

Options

• A:
• B:
• C:
• D:

Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): $\alpha$-halocarboxylic acid on reaction with dil. ${\mathrm{NH}}_3$ gives good yield of $\alpha$-amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides.

Reason (R): Amino acids exist in zwitter ion form in aqueous medium.

In the light of the above statements, choose the correct answer from the options given below :

JEE Main 2023 (01 Feb Shift 2)

Options

• A: Both (A) and (R) are correct and (R) is the correct explanation of (A).
• B: Both (A) and (R) are correct but (R) is not the correct explanation of (A).
• C: (A) is correct but (R) is not correct.
• D: (A) is not correct but (R) is correct.

Question

Match items of Row I with those of Row II.

Row I:

(P)

(Q)

(R)

(S)

Row II:

(i) $\mathrm{\alpha }‐\mathrm{D}‐(—)$ Fructofuranose.

(ii) $\mathrm{\beta }‐\mathrm{D}‐(—)$ Fructofuranose.

(iii) $\mathrm{\alpha }‐\mathrm{D}‐(‐)$ Glucopyranose.

(iv) $\mathrm{\beta }‐\mathrm{D}‐(‐)$ Glucopyranose.

Correct match is

JEE Main 2023 (25 Jan Shift 1)

Options

• A: P→iv, Q→iii, R→i, S→ii
• B: P→i, Q→ii, R→iii, S→iv
• C: P→iii, Q→iv, R→ii, S→i
• D: P→iii, Q→iv, R→i, S→ii

Question

Following tetrapeptide can be represented as

($\mathrm{F},\mathrm{L},\mathrm{D},\mathrm{Y},\mathrm{I},\mathrm{Q},\mathrm{P}$ are one letter codes for amino acids)

JEE Main 2023 (29 Jan Shift 2)

Options

• A: $\mathrm{FIQY}$
• B: $\mathrm{FLDY}$
• C: $\mathrm{YQLF}$
• D: $\mathrm{PLDY}$

Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Ketoses give Seliwanoff’s test faster than Aldoses.

Reason (R): Ketoses undergo $\beta$-elimination followed by formation of furfural.

In the light of the above statements, choose the correct answer from the options given below:

JEE Main 2023 (30 Jan Shift 1)

Options

• A: (A) is false but (R) is true
• B: Both (A) and (R) are true and (R) is the correct explanation of (A)
• C: (A) is true but (R) is false
• D: Both (A) and (R) are true but (R) is not the correct explanation of (A)

Question

Compound $\mathrm{A},{\mathrm{C}}_5{\mathrm{H}}_{10}{\mathrm{O}}_5$, given a tetraacetate with ${\mathrm{AC}}_2\mathrm{O}$ and oxidation of $\mathrm{A}$ with ${\mathrm{Br}}_2-{\mathrm{H}}_2\mathrm{O}$ gives an acid, ${\mathrm{C}}_5{\mathrm{H}}_{10}{\mathrm{O}}_6$. Reduction of $\mathrm{A}$ with $\mathrm{HI}$ gives isopentane. The possible structure of $\mathrm{A}$ is :

JEE Main 2023 (31 Jan Shift 2)

Options

• A:

  

   

   

• B:

  

   

   

• C:

  

   

• D:

  

   

   

Question

Which is not true for arginine?

JEE Main 2023 (15 Apr Shift 1)

Options

• A: It has a fairly high melting point
• B: It is associated with more than one ${\mathrm{pK}}_{\mathrm{a}}$ values.
• C: It has high solubility in benzene.
• D: It is a crystalline solid.

Question

Which of the following is the correct structure of L-Glucose?

JEE Main 2024 (04 Apr Shift 1)

Options

• A:
  
• B:
  
• C:
  
• D:
  

Question

Match List I with List II \(\begin{array}{|l|l|c|l|} \hline & \text{List - I} & & \text{List - II} \\ \hline \text { A. } & \alpha \text { - Glucose and } \alpha \text { - Galactose } & \text { I. } & \text { Functional isomers } \\ \hline \text { B. } & \alpha \text { - Glucose and } \beta \text { - Glucose } & \text { II. } & \text { Homologous } \\ \hline \text { C. } & \alpha \text { - Glucose and } \alpha \text { - Fructose } & \text { III. } & \text { Anomers } \\ \hline \text { D. } & \alpha \text { - Glucose and } \alpha \text { - Ribose } & \text { IV. } & \text { Epimers } \\ \hline \end{array}\) Choose the correct answer from the options given below:

JEE Main 2024 (04 Apr Shift 2)

Options

• A: A-IV, B-III, C-I, D-II
• B: A-III, B-IV, C-I, D-II
• C: A-IV, B-III, C-II, D-I
• D: A-III, B-IV, C-II, D-I

Question

The total number of carbon atoms present in tyrosine, an amino acid, is _______

JEE Main 2024 (08 Apr Shift 2)

Enter your answer

Question

The incorrect statement about Glucose is :

JEE Main 2024 (09 Apr Shift 2)

Options

• A: Glucose is soluble in water because of having aldehyde functional group
• B: Glucose remains in multiple isomeric form in its aqueous solution
• C: Glucose is one of the monomer unit in sucrose
• D: Glucose is an aldohexose

Question

 Match List I with List II 

JEE Main 2024 (29 Jan Shift 2)

Options

• A: A-II, B-I, C-III, D-IV
• B: A-IV, B-II, C-I, D-III
• C: A-I, B-III, C-IV, D-II
• D: A-II, B-III, C-I, D-IV

Question

Match List I with List I

Choose the correct answer from the options given below:

JEE Main 2024 (29 Jan Shift 1)

Options

• A: A-II, B-IV, C-I, D-III
• B: A-II, B-III, C-IV, D-I
• C:  A-III, B-II, C-IV, D-I
• D: A-IV, B-III, C-I, D-II

Question

Match List I with List II

Choose the correct answer from the options given below:

JEE Main 2024 (31 Jan Shift 1)

Options

• A: A-IV, B-I, C-III, D-II
• B: A-II, B-IV, C-III, D-I
• C: A-III, B-II, C-I, D-IV
• D: A-I, B-IV, C-III, D-II