For a reaction 1/2 A→ 2B rate of disapperance of A is related to rate of appearance of B by the expression.

• $-\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}= \frac{1}{2}\frac{\mathrm{d}\left[\mathrm{B}\right]}{\mathrm{dt}}$

• $-\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}= 4\frac{\mathrm{d}\left[\mathrm{B}\right]}{\mathrm{dt}}$

• $-\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}= \frac{\mathrm{d}\left[\mathrm{B}\right]}{\mathrm{dt}}$

• $-\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}= \frac{1}{4}\frac{\mathrm{d}\left[\mathrm{B}\right]}{\mathrm{dt}}$

The coordination number and the oxidation state of the element 'M' in the complex [M(en)₂(C₂O₄)] NO₂ {where (en) is ethan 1, 2-diamine} are respectively

• 6 and 3

• 4 and 3

• 6 and 2

• 4 and 2

Which of the following reagent cannot be used to oxidise primary alcohols to aldehydes?

• Pyridinium chlorochromate

• KMnO₄ in acidic medium

• CrO₃ in anhydrous medium

• Heating in presence of Cu at 573K

The product formed during the following reaction are

Bactericidal antibiotics among the following is

• tetracycline

• erythromycin

• ofloxcin

• chloromphenicol

46.

Which of the following is not a biodegradable polymer?

• Glyptol

• Polyhydroxy butyrate-CO-β-hyrdoxy valerate

• PHBV

• Nylon 2-nylon-6

Reduction of ketones cannot be carried out with which of the following reagents?

• Sodium borohydride or lithium aluminium hydride

• Zinc amalgam and conc.HCl

• Hydrazine and KOH in ethylene glycol

• Hydrogen in presence of palladium in barium sulphate and quinoline

Toluene reacts with halogen in presence of iron (III) chloride giving ortho and para halo compounds. The reaction is

• nucleophilic substitution reaction

• free radical addition reaction

• electrophilic elimination reaction

• electrophilic substitution reaction

The correct order of increasing basic nature for the bases NH₃, CH₃NH₂ and (CH₃)₂NH in aqueous solution

• CH₃NH₂ < NH₃ < (CH₃)₂NH

• NH₃ < CH₃NH₂ <(CH₃)₂NH

• CH₃NH₂ < (CH₃)₂NH < NH₃

• (CH₃)₂NH < NH₃ <CH₃NH₂ 

The glycosidic linkage present in sucrose is between

• C-1 of -β- glucose and C-4 of α- glucose

• C-1 of α- glucose and C-4 of β-fructose

• C-1 of α- glucose and C-4 of α- glucose

• C-1 of α- glucose and C-2 of β-fructose