Chemistry Chapter 18 Entry Test MCQs
26. Among the following acids which has the lowest pKa value?
a. (CH3)2CH – COOH
b. CH3COOH
c. CH3CH2COH
d. HCOOH
27.An organic compound reacts (i) with metallic sodium to liberate hydrogen and (ii) with Na2CO3 solution to liberate CO2. the compound is
a. an alcohol
b. an ether
c. a carboxylic acid
d. an ester
28. Which one shows CH2O the empirical formula
a. HCOOH
b. C6H5CHO
c. CH3COOH
d. C2H5OH
29. When CH2 = CH – COOH is reduced with LiAIH4 the compound obtained will be
a. CH3 – CH2 – CH2OH
b. CH3 – CH2– COOH
c. CH3 – CH2 – CHO
d. CH2 = CH – CH2OH
30. The colourless liquid carboxylic acid with pungent smell have carbon atoms
a. C4 to C6
b. C1 to C4
c. C5 to C10
d. C1 to C3
31. Which metals react with carboxylic acids to liberate H2?
a. Na, Cu, Ca
b. Na, K, Mg
c. Ag, Mg, Ca
d. Zn, Ag, Cu
32. Acetic acid freezes at 17°C and it is ——- with water.
a. Miscible
b. Soluble
c. Immiscible
d. Insoluble
Derivatives of Carboxylic Acids
33. Which is most reactive of the following?
a. Acetamide
b. Ethyl acetate
c. Acetyl chloride
d. Acetic anhydride
34. Ethyl acetate at room temperature is a
a. Gas
b. Solid
c. Solution
d. Liquid
35. Two moles of acetic acid are heated with P2O5. The product formed is
a. Formic anhydride
b. 2 moles of ethyl alcohol
c. 2 moles of methyl cyanide
d. Acetic anhydride
36. Hydrolysis of an ester gives a carboxylic acid which on Kolbe’s electrolysis yields ethane. The ester is
a. Propylmethanoate
b. Ethyl methonoate
c. Ethylpropanoate
d. Methyl ethanoate
37. Acetyl chloride is reduced with LiAlH4 the product formed is
a. Acetaldehyde
b. Methyl alcohol
c. Acetone
d. Ethyl alcohol
38. In the preparation of an ester, the commonly used dehydrating agent is
a. Anhydrous calcium carbide
b. Phosphorus pentaxide
c. Concentrated sulphuric acid
d. Anhydrous aluminium chloride
39. Fruity smell is given by
a. Chloroform
b. Esters
c. Acid anhydrides
d. Alcohols
40. The correct priority of functional groups in IUPAC nomenclature is
a. Ester > amide > ketone > acid
b. Amides > acid > ester > ketone
c. Acid > ester > amide > ketone
d. Ketone > acid > ester > amide
41. The relation reactivities of acyl compounds towards nucleophillic substitution are in order of:
a. Acyl chloride > Acid anhydride > Ester > Amide
b. Acid anhydride > Amide > Ester > Acyl chloride
c. Ester > Acyl chloride > Amide > Acid anhydride
d. Acyl chloride > Ester > Acid anhydride > Amide
42. The flavour of ethyl butyrate is:
a. Jasmine
b. Pine – apple
c. Banana
d. Apricot
43. Which of following is cannot be directly prepared from acetic acid:
a. Ethyl acetate
b. Acetamide
c. Acetyl chloride
d. Acetic anhydride
Amino Acids
44. Which of the following amino acids has to be supplemented in the diet?
a. Glutamine
b. Phenylalanine
c. Asparagines
d. cysteine
45. The naturally occurring proteins consist of
a. D-amino acids
b. L-amino acids
c. both ( A) and ( C)
d. No configuration
46. Amino acids with aromatic side chain are
a. tryptophan, threonine, tyrosine
b. tryptophan, asparagine, tyrosine
c. phenylalanine, tryptophan, tyrosine
d. phenylalanine, tryptophan, serine
47. Which of the following amino acids is not necessary to be taken in the diet?
a. Serine
b. Histidine
c. lysine
d. threonine
48. Amino acids with the aliphatic ‘R’ group are
a. Serine, threonine, cysteine
b. Glycine, alanine, leucine
c. Phenylalanine, tyrosine and tryptophan
d. Lysine, arginine, histidine
49. The simplest amino acid is
a. Asparagine
b. Glycine
c. Tyrosine
d. Alanine
50. The term internal salt refers to
a. Basic character of amino acids
b. Acidic character of amino acids
c. Non-polar structure of amino acids
d. Dipolar character of amino acids
51. Acidic amino acids have
a. 1 amino and 1 carboxylic groups
b. 2 amino groups and 1 carboxylic group
c. 2 amino and 2 carboxylic groups
d. 2 carboxylic groups and 1 amino group
52. In the formation of Zwitter ions proton goes from
a. Amino to carboxyl group
b. Carboxyl to amino group
c. Carboxyl group only
d. Amino group only
53. The test which is used for the identification of amino-acids is
a. Biuretic test
b. Ninhydrin test
c. Benedict test
d. Molisch test
54. A pentapeptide has total no. of amino acid and peptide bonds respectively:
a. 4, 5
b. 5, 5
c. 5, 4
d. 4, 3