Chapter 7

Which of the following statements is correct? (a) The Ruff procedure lengthens an aldose chain and gives a single product. (b) (c) The Kiliani-Fischer procedure shortens an aldose chain and gives a single product. (d) The Kiliani-Fischer procedure lengthens an aldose chain and gives two epimers.

Which of the following is \(/\) are co-polymer (s)? (a) Nylon-66 (b) Bakelite (c) Teflon (d) Polystyrene

Which of the following is not a disaccharide? (a) sucrose (b) mannose (c) lactose (d) maltose

Which of the following do not undergo hydrolysis? (a) Glucose (b) Fructose (c) Cane sugar (d) Maltose

Which statement about the pyranose form of mannose is not correct? (a) it exists as two anomeric stereoisomers. (b) it reacts with Tollen's reagent to give a silver mirror (i.e., it is a reducing sugars). (c) reaction with excess \(\mathrm{CH}_{3} \mathrm{I}\) and \(\mathrm{AgOH}\) gives a non-reducing penta-O-methyl derivative. (d) it resists reduction with aqueous sodium borohydride.

Among the following polymers, peptide linkage is present in (a) Nylon-66 (b) Protein (c) Nylon-6 (d) Tafflon

Two aldopentoses \(\mathrm{X}\) and \(\mathrm{Y}\) give the same osazone derivative. \(\mathrm{X}\) is oxidised to an optically active aldaric acid by dilute nitric acid. Ruff degradation of \(Y\) gave a tetrose which was similarly oxidised to an optically active aldaric acid. Assign the structures of \(X\) and \(Y\) from the following list.

What is invert sugar, and why is it so named? (a) the sugar mixture from hydrolysis of sucrose; fructose is isomerised to glucose. (b) the sugar mixture from hydrolysis of sucrose; the optical rotation changes from \((+)\) to \((-)\). (c) the sugar mixture from hydrolysis of starch; \(\alpha\) -glycosidic bonds are changed to \beta-glycosidic bonds. (d) the sugar mixture from hydrolysis of starch; glucose is isomerised to fructose.

Among the following polymers, identify the co-polymer (a) Nylon-6 (b) Buna-N (c) Buna-S (d) Protein

Among the following polymers, identify the co-polymer (a) Terylene (b) Glyptal (c) PVC (d) Protein

Among the following polymers, identify the homopolymer (a) Bakelite (b) Dacron (c) Natural rubber (d) Orlon

Gentiobiose is a disaccharide incorporated into the chemical structure of crocin, the chemical compound that gives saffron its colour. Deduce the structure of gentiobiose from the following information. (i) Acid hydrolysis of gentiobiose yields only D-glucose. (ii) Gentiobiose is hydrolysed by \(\beta\) -glucosidase enzymes, but not by \(\alpha\) -glucosidase enzymes. (iii) Gentiobiose is a reducing sugar and reacts with sodium borohydride. (iv) Methylation of gentiobiose followed by hydrolysis of the glycosidic bonds yields the two D-glucose derivatives shown below.

The formula of lysine is \(\mathrm{H}_{2} \mathrm{~N}\left(\mathrm{CH}_{2}\right)_{3} \cdot \mathrm{CH}_{2}-\mathrm{CH}-\mathrm{COOH}\) for lysine the value of \(\mathrm{pK}_{\mathrm{a}_{1}}, \mathrm{pK}_{\mathrm{a}_{2}}\) and \(\mathrm{pK}_{\mathrm{a}_{3}}\) are 2.2, \(9.0\) and \(10.5\) respectively. The \(\mathrm{pH}\) at isoelectric point of lysine is (a) \(5.6\) (b) 7 (c) \(6.35\) (d) \(9.75\)

Which one of the following is a non-reducing sugar? (a) Glucose (b) Mannose (c) Fructose (d) Sucrose

Which of the following compounds will not show mutarotation? (a) Methyl- \(\alpha\) -D-glucopyranoiside (b) \(\alpha\) -D (+) glucospyranose (c) \(\beta\) -D (+) glucopyranose (d) \(\beta-\mathrm{D}(+)\) galactopyranose

Which one of the following is a monomer of condensation polymer? (a) \(\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{5}-\mathrm{COOH}\) (b) \(\mathrm{HO}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{OH}\) (c) \(\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{NH}_{2}\) (d) \(\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{CONH}_{2}\)

\(\alpha\) -D-glucose and \(\beta\) -D-glucose are (a) anomers (b) \(\mathrm{C}_{2}\) -epimers (c) \(\mathrm{C}_{3}\) -epimers (d) enantiomers

Natural rubber is which type of polymer? (a) Condensation (b) Addition (c) Coordinate (d) None of these

At isoelectric point, the amino acid has (a) Least viscosity (b) Maximum surface tension (c) Minimum solubility (d) All of these

Among the following, identify the condensation polymer (a) Nylon-6 (b) Buna-N (c) Polystyrene (d) Nylon-6-6

Which one of the following is not correct for monosaccharides? (a) They are optically active polyhydroxy carbonyl compounds (b) Fructose is ketose sugar and hence it does not give red precipitate with Fehling's solution (c) \(\alpha\) -D (+) glucose and \(\beta-\mathrm{D}\) ( \(+)\) glucose are anomers (d) Glucose and mannose are epimers

Which of the following is a non-reducing sugar?

Which one of the following is \(\mathrm{C}-2\) epimers? (a) Glucose and galactose (b) Glucose and mannose (c) Glucose and fructose (d) Galactose and fructose

Tertiary structure of protein contains which type of forces? (a) Electrostatic forces only (b) Electrostatic as well as hydrogen bonds (c) Electrostatic, hydrogen bonds and Vander waal forces (d) Electrostatic, hydrogen bonds, Vander waal forces, dipole-dipole attractions and disulphide crosslinkage.

Which of the following statements about lactose is not correct? (a) It does not reduces Tollen's reagent (b) It is a disaccharide. On hydrolysis, it produces two monosaccharides (c) It possess glycosidic linkage (d) All of them

Which of the following is an addition and homopolymer? (i) Neoprene (ii) Polystyrene (iii) Nylon-6,6 (iv) Nylon-6 (a) only (b) \(\mathrm{i}, \mathrm{ii}\) and iv (c) \(\mathrm{i}\) and \(\mathrm{ii}\) (d) i, ii, iii and iv

Identify structure of guanine

Identify structure of Nylon-6

Among the following polymer identify homopolymer (a) Nylon-6 (b) Buna-N (c) Buna-S (d) Polyethylene

Among the following polymers, identify the copolymer (a) Nylon-6 (b) Starch (c) PVC (d) Protein

Which of these is a hypnotic? (a) Metaldehyde (b) Acetaldehyde (c) Paraldehyde (d) None of these

An ester used as medicine is (a) ethyl acetate (b) methyl acetate (c) methyl salicylate (d) ethyl benzoate

Nylon threads are made of (a) polyvinyl polymer (b) polyester polymer (c) polyamide polymer (d) polyethylene polymer

Paracetamol is an (a) antibiotic (b) antipyretic (c) antimalarial (d) analgesic

Antiseptic, chlorozylenol is (a) 4 -chloro- 3,5 -dimethyl phenol (b) 3 -chloro- 4,5 -dimethyl phenol (c) 4 -chloro- 2,5 -dimethyl phenol (d) 5 -chloro- 3,4 -dimethyl phenol

Phenacetin is used as on. (a) antipyretic (b) antiseptic (c) analgesic (d) antimalarial

Which of the following colours is imparted by alizarin dye in the presence of \(\mathrm{Cr}^{3+}\) ion? (a) Violet (b) Brown-red (c) Pink (d) Red

Which of the following polymers can be used for lubrication and as an insulator? (a) \(\mathrm{SBR}\) (b) PVC (c) PTFE (d) PAN

A hybrid rocket propellant uses (a) a liquid oxidiser and a solid fuel (b) a composite solid propellant (c) a biliquid propellant (d) a solid liquid and gas as a propellant

Buna-N synthetic rubber is a copolymer of (a) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\stackrel{\mathrm{Cl}}{\mathrm{C}}=\mathrm{CH}_{2}\) and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\) and \(\mathrm{H}_{5} \mathrm{C}_{6}-\mathrm{CH}=\mathrm{CH}_{2}\) (c) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CN}\) and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\) (d) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CN}\) and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{Cl}=\mathrm{CH}_{2}\)

Among cellulose, polyvinyl chloride, nylon and natural rubber, the polymer in which the intermolecular force of attraction is weakest is (a) nylon (b) polyvinyl chloride (c) cellulose (d) natural rubber

What is the complementary RNA sequence for the DNA segment AATCAGTT? (a) AAUCAGUU (b) CCAUCGAA (c) AACUGAUU (d) UUAGUCAA

In DNA replication the complementary nucleotide sequence for \(5^{\prime}-\mathrm{ACGT}-3^{\prime}\) is which of the following? (a) \(3^{\prime}-\mathrm{ACGT}-5^{\prime}\) (b) \(3^{\prime}-\mathrm{TGCA}-5^{\prime}\) (c) \(5^{\prime}-\mathrm{AGCT}-3^{\prime}\) (d) \(5^{\prime}\) -TCGA-3 \(^{\prime}\)

Which of the following is not a disaccharide? (a) sucrose (b) mannose (c) lactose (d) maltose

The pupils of eyes are dilated with a very dilute solution of an alkaloid which is (a) adrenaline (b) atropine (c) equanil (d) ephedrine

Penicillin was first discovered by (a) A. Fleming (b) L. Pasteur (c) G. Thompson (d) A. Noble

The poisonous gas evolved in Bhopal tragedy was (a) \(\mathrm{COCl}_{2}\) (b) \(\mathrm{CH}_{3} \mathrm{NCO}\) (c) \(\mathrm{CH}_{3} \mathrm{CN}\) (d) \(\mathrm{CO}\)

In making lemon pickle (a) chillies are used to kill all germs and bacteria (b) lemon oil acts as a preservative (c) salt plays the same role as sugar in jam (d) citric acid acts as a preservative

Synthetic polymer which resembles natural rubber is (a) chloroprene (b) glyptal (c) nylon (d) neoprene

\(\mathrm{D}-(+)\) -Glucose shows mutarotation because (a) it undergoes interconversion with \(\mathrm{D}-(-)\) -fructose (b) it undergoes interconversion between its pyranose structure and furanose structure (c) it undergoes interconversion between its \(\alpha\) -D-(+)-glucopyranose and \(\beta-\mathrm{D}-(+)\) glucopyranose structures via the open-chain structure (d) it is dextrorotatory