41.

Which of the following is not a polymer?

• Cholesterol

• Oxytocin

• Amylose

• RNA

Which ligand is useful for removal of the toxic effect of lead metal in body in chelate therapy treatment?

• AsO${}_4^{3-}$

• CH₃COO^-

• (COO^-)₂

• 

The reaction,

R-CO-R $\underset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{{\mathrm{N}}_3\mathrm{H}}{\to }}$ RCONHR + N₂ is called

• Claisen-Schmidt reaction

• Kolbe-Schmidt reaction

• Schmidt reaction

• Kolbe's reaction

When glucose reacts with acetone in acidic medium, the main product is

• laevulic acid

• glycosazone

• dioxopropylidene glucose

• None of the above

Which of the following is not true for antibiotics?

• Tetracycline is one of the broad spectrum antibiotics which are effective against a large number of harmful microorganisms

• Streptomycin is highly effective against microorganisms which cause tuberculois

• Penicillin has a narrow spectrum and certain persons are sensitive to it

• Penicillin may be administered without testing the patients for sensitivity to it

How much ethyl alcohol C₂H₅OH, must be added to 1.00 L of water so that the solution will not freeze at - 4°F?

• 211 gm

• 495 gm

• 85 gm

• 46 gm

The reagent(s) used in the preparation of aspirin from salicylic acid

• SOCl₂, pyridine

• (CH₃CO)₂O, H⁺

• CH₃CO₂H, HCl

• CH₃Cl, AlCl₃

Chlorobenzene is o, p-directing in electrophilic substitution reaction. The directing influence is explained by

• +M of Ph

• +I of Cl

• +M of Cl

• -I of Ph

The end product 'C' in the following reaction-

Moth repellents are

• 

• perchloroethane

• 

• All of these