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a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Fourteen

Write the reactions of D− glucose which can't be explained by its open-chain structure. How can cyclic structure of glucose explain these reactions?
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A
alok kumar singh

Contributor-Level 10

This is a Long answer type Questions as classified in NCERT Exemplar

Ans: The open chain structure of glucose explained the majority of its properties. However, it fails to explain the following facts:

I Although glucose has an aldehydic group, it does not undergo all aldehydic reactions.

(a) Glucose does not react with ammonia, for example.

(b) Glucose does not create an addition product when it combines with sodium bisulphite.

(c) Glucose does not pass the Schiff's test or the 2, 4-DNP test, unlike other aldehydes.

(ii) Glucose forms an oxime when it reacts with hydroxylamine, but glucose pentaacetate does not. This proves that g

...more

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Fourteen

Assertion: In presence of enzyme, substrate molecule can be attacked by the reagent effectively. Reason: Active sites of enzymes hold the substrate molecule in a suitable position.

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

This is an Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans:  (i)

Because enzyme active sites hold the substrate molecule in a favourable location, a reagent can successfully attack the substrate molecule in the presence of enzyme. As a result, reactions catalysed by enzymes are stereospecific.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Fourteen

Assertion: Glycine must be taken through diet. 

Reason: It is an essential amino acid. 

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.
0 Follower 3 Views

A
alok kumar singh

Contributor-Level 10

This is an Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans:  (ii)

Non-essential amino acids are amino acids that can be synthesized in the body and need not be taken from outside through diet. Glycine is an example of non-essential amino acids and is available in plenty of foods.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Fourteen

Assertion: Deoxyribose, C5H10O4 is not a carbohydrate. 

Reason: Carbohydrates are hydrates of carbon so compounds which follow C2(H2O)g formula are carbohydrates. 

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.
0 Follower 16 Views

A
alok kumar singh

Contributor-Level 10

This is an Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans:  (ii)

When DNA (or RNA) is completely hydrolyzed, it produces a 5 carbon based sugar called pentose sugar, phosphoric acid, and nitrogen-containing heterocyclic molecules (called bases). The sugar moiety of the nucleic acid, DNA is β−D−2− deoxyribose. Therefore, both assertion and reason are wrong statements.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Fourteen

Assertion: All naturally occurring α− amino acids except glycine are optically active. 

Reason: Most naturally occurring amino acids have L- configuration. 

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.
0 Follower 12 Views

A
alok kumar singh

Contributor-Level 10

This is an Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans:  (v)

All other naturally occurring alpha-amino acids, with the exception of glycine, are optically active due to the asymmetry of the α - carbon atom. Both of these ' D ' and ' L ' configurations are available. The majority of amino acids found in nature have a L− configuration. The group on the left side is used to designate L− amino acids.

naturally occurring amino acids have a configuration. The −NH2 group on the left side is used to indicate amino acids.

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen

Predict the reagent or the product in the following reaction sequence.

 
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V
Vishal Baghel

Contributor-Level 10

This is a Long Answer Type Questions as classified in NCERT Exemplar

Ans:

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Fourteen

Assertion: ? - glycosidic linkage is present in maltose.

Reason: Maltose is composed of two glucose units in which C−1 of one glucose unit is linked to C−4 of another glucose unit.

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.
0 Follower 2 Views

A
alok kumar singh

Contributor-Level 10

This is an Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: (iv)

Maltose is made up of two? D? glucose units, one of which, C?1, is coupled to the C?4 of the other one. As a result, maltose contains a? glycosidic linkage. As a result, the assertion is a false statement, but the reason is true.

 

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen

A colourless substance ' A′(C6H7 N) is sparingly soluble in water and gives a water soluble compound ' B ' on treatment with mineral acid. On reacting with CHCl3 and alcoholic potash 'A' produces an obnoxious smell due to the formation of compound ' C '. Reaction of 'A' with benzenesulphonyl chloride gives compound ' D ' which is soluble in alkali. With NaNO2 and, ' A ' forms compound ' E ' which reacts with phenol in alkaline medium to give an orange dye ' F ' Identify compounds ' A ' to ' F '.
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V
Vishal Baghel

Contributor-Level 10

This is a Long Answer Type Questions as classified in NCERT Exemplar

Ans:

 

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen

A hydrocarbon ' A ', (C4H8) on reaction with HCl gives a compound ' B ' (C4H9Cl), which on reaction with 1 mol of NH3 gives compound ' C ', (C4H11 N). On reacting with NaNO2 and HCl followed by treatment with water, compound ' C ' yields an optically active alcohol, ' D '. Ozonolysis of ' A ' gives 2 moles of acetaldehyde. Identify compounds 'A' to 'D'. Explain the reactions involved.
0 Follower 5 Views

V
Vishal Baghel

Contributor-Level 10

This is a Long Answer Type Questions as classified in NCERT Exemplar

Ans:

New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Fourteen

Assertion: Vitamin D can be stored in our body. 

Reason: Vitamin D is fat soluble vitamin.

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.
0 Follower 5 Views

A
alok kumar singh

Contributor-Level 10

This is an Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans:  (i)

Vitamins that are fat soluble are soluble in fats and oils but insoluble in water. They can be stored in the liver as well as adipose (fat-storing) tissues and are not excreted in urine . As a result, both assertion and reason are true assertions, and reason clarifies the assertion.

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