12th class (Fsc) Chemistry unit 13 MCQs
26. Carboxylic acids on reduction with HI and red phosphorus give:
a. Aldehydes
b. Alkanes
c. Ketones
d. Alcohols
27. Which gas is evolved for carboxylic acids treated with carbonates and bicarbonates?
a. Carbon dioxide gas
b. Oxygen gas
c. Carbon monoxide
d. Hydrogen gas
28. The reaction of carboxylic acid with alcohols in the presence of conc. H2SO4 is called:
a. Hydrolysis
b. Esterification
c. Saponification
d. Neutralization
29. The melting point of pentanoic acid is:
a. -46oC
b. -36oC
c. -16oC
d. -26oC
30. The C=O group of carboxyl group , like aldehydes and ketones is susceptible to:
a. Attack by a nucleophile
b. Oxidation
c. Attack by an electrophile
d. All of given
31. The replacement of OH group of carboxylic acid by which one of the following will result in th formation of acid amides?
a. NHR
b. NH3
c. NR2
d. NH2
32. The bee sting can be neutralized by using:
a. H2SO4
b. NaOH
c. NaCHO3
d. Na2CO3
33. Which alcohol is formed as an intermediate during the conversion of acetylene into acetaldehyde?
a. Alkyl alcohol
b. Vinyl alcohol
c. Ethyl alcohol
d. None of given
34. Which of the following has raspberry flavour?
a. Amyl butyrate
b. Amyl lactate
c. Isobutyl formate
d. Benzyl acetate
35. By which process vinyl alcohol an intermediate is converted into acetaldehyde?
a. Rearrangement
b. Oxidation
c. Reduction
d. Dehydration
36. Which one of the following is used in medicate as a local irritant?
a. Formic acid
b. Proponic acid
c. null
d. Acetic acid
37. The molecular mass of protein is:
a. Equal to 10,000
b. Less than 10,000
c. Equal to 9,000
d. Greater then 10,000
38. In a polypeptide, which type of bond responsible fro joining a large number of amino acids?
a. Peptide bond
b. Metallic bond
c. Hydrogen bond
d. Double bond
39. Which one of the following is not an ammo acid?
a. Aspartic acid
b. Lactic acid
c. Histidne
d. G.jtrran acid
40. How many amino acids are essential:
a. 10
b. 18
c. 12
d. 15
41. The simplest a-amino acid is:
a. Valine
b. Alanine
c. Proline
d. Alycine
42. Which one of the following is an imino acid?
a. Apartic acid
b. Proline
c. Lysine
d. Valine
43. Which one the following pairs contains neutral amino acids?
a. Valine and proline
b. Lysine and histidne
c. Glycine and alanine
d. Both a and c
44. How many amino acids hace been identified as the consituent of most of the animals and plant proteins?
a. 20
b. 16
c. 16
d. 18
45. A zwitter ion has which of the following properties?
a. A high melting point
b. No net charge
c. Soluble in water
d. All of these
46. Which one of the following compounds forms zwitter ions?
a. Phenols
b. Carbonyl compounds
c. Carbcxylic add
d. Amino acid
47. The polypeptides are.
a. Co-polymers
b. Condensation polymers
c. Addition polymers
d. None of these
48. A polypeptides is a:
a. Polyamide
b. Polyester
c. Poly imine
d. Polyamine
49. By convention of polypeptide has molecular mass:
a. More then 10,000
b. Upto 10,000
c. Less then 20,000
d. Less then 10,000
50. The complete reduction of carboxylic acid is done by using:
a. LiAIH
b. H2/Ni
c. HI+Red phosphorus
d. NaBH4