CBSE Class 12 Chemistry Daily Practice Questions 18 October 2023

CBSE Class 12 Chemistry Daily Practice Questions 18 October 2023: Chemistry being the fundamental subject demands a conceptual understanding of chemical reactions and formulas. Solving CBSE Class 12th Chemistry practice questions is essential to score well in the board examination. Candidates are recommended to practice the questions shared here to score high in the CBSE Class 12 chemistry exam and attain a better understanding of the subject. 

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CBSE Class 12 Chemistry Daily Practice Questions 18 October 2023

Check out the daily practice questions for 18 October 2023 here as per their sections/question-types: 

Section A: Multiple-Choice Questions

An α-helix is a structural feature of 
(a) Sucrose
(b) Polypeptides
(c) Nucleotides
(d) Starch

Section B: Very Short Answer Type Question

(i) Oxidation of propanal is easier than propanone. Why?
(ii) How can you distinguish between Acetophenone and Benzophenone?

Section C: Short Answer Type Question

What happens when
(i) Anisole is treated with CH3Cl/anhydrous AlCl3 ?  
(ii) Phenol is oxidised with Na2Cr2O7 /H+ ?
(iii) (CH3 )3 C – OH is heated with Cu/573 K ?
Write chemical equation in support of your answer.

Section D: Long Answer Type Question

(I) Give reasons :
(i) Aniline on nitration gives good amount of m-nitroaniline, though – NH2 group is o/p directing in electrophilic substitution reactions.
(ii) (CH3 )2 NH is more basic than (CH3 )3N in an aqueous solution.
(iii) Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.
(II) Write the reaction involved in the following :
(i) Carbyl amine test
(ii) Gabriel phthalimide synthesis

Section E: Case-Based Question

Carbohydrates are optically active polyhydroxy aldehydes and ketones. They are also called saccharides. All those carbohydrates which reduce Fehling’s solution and Tollen’s reagent are referred to as reducing sugars. Glucose, the most important source of energy for mammals, is obtained by the hydrolysis of starch. Vitamins are accessory food factors required in the diet. Proteins are the polymers of α-amino acids and perform various structural and dynamic functions in the organisms. Deficiency of vitamins leads to many diseases.
Answer the following :
(a) The penta-acetate of glucose does not react with Hydroxylamine. What does it indicate ? 
(b) Why cannot vitamin C be stored in our body ?
(c) Define the following as related to proteins :
(i) Peptide linkage
(ii) Denaturation

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