Biomolecules and Polymers
The correct structure(s) of β-L-glucopyranose is (are)
(Given : specific rotations of (+)-sucrose, (+)-maltose, L-(−)-glucose and L-(+)-fructose in aqueous solution are +66°, +140°, −52° and +92°, respectively)
Treatment of compound O with KMnO4/H+ gave P, which on heating with ammonia gave Q. The compound Q on treatment with Br2/NaOH produced R. On strong heating, Q gave S, which on further treatment with ethyl 2–bromopropanoate in the presence of KOH followed by acidification, gave a compound T.
The compound T is
Assertion Neoprene can be further hardened by heating in presence of sulphur.
Reason Neoprene contains allylic double bonds which help in introducing sulphur bridges between different polymer chains.
Assertion Deoxyribose, C5H10O4 is not a carbohydrate.
Reason Carbohydrates are hydrates of carbon so compounds which follow Cx(H2O)y formula are carbohydrates.
A tetra peptide has −COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetra peptide, the number of possible sequences (primary structures) with −NH2 group attached to a chiral center is
Antiseptics and disinfectants either kill or prevent growth of microrganisms. Identify which of the following statements is not true:
The substitutes and for nine peptides are listed in the table given below. How many of these peptides are positively charged at?
Assertion The term anomers of glucose refers to isomers of glucose that differ in configuration at carbon one (C − 1).
Reason Anomers of glucose are cyclic diastereomers differ in configuration at C − 1 existing in two forms α-and β-respectively.
A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine (Mol. Wt 75), alanine and phenylalanine. Glycine contributes 47.0% to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is
Assertion : Aspirin can cause ulcer in the stomach.
Reason : The ester group in aspirin gets hydrolysed to acid group in the stomach where the pH is 2.
Reason : Bithional is a sulpha drug.
Reason : Vulcanisation introduces the polysulphide bridges at reactive sites.
Among cellulose, poly (vinyl chloride), nylon and natural rubber, the polymer in which the intermolecular force of attraction is weakest is
STATEMENT-1: Glucose gives a reddish-brown precipitate when reacted with Fehling’s solution.
STATEMENT-2: Glucose on reaction with Fehling’s solution gives CuO and gluconic acid.
|(B)||nylon-6, 6||(q)||synthetic polymer|
Arrange in order of increasing acidic strength.
(A) X > Z > Y
(B) Z < X > Y
(C) X > Y > Z
(D) Z > X > Y
(A) Glucose, sucrose
(B) Glucose, fructose
(C) Hexanal, acetophenone
(D) Fructose, sucrose
(i) Identify the four functional groups.
(ii) Write the zwitterionic structure.
(iii) Write the structures of the amino acids obtained from the hydrolysis of aspartame.
(iv) Which of the two amino acids is more hydrophobic?