12th class (Fsc) Chemistry unit 7 MCQs
51. Which of the following is knocking:
a. n-Pentane
b. n-Heptane
c. iso-Octane
d. n-Hexane
52. During combustion of tetraethyl lead. produced?
a. MnO2
b. PbO
c. Cr2O3
d. Fe2O3
53. Which type of cracking is used for the production of higher octane number?
a. Octane number
b. Catalytic cracking
c. Any one of given
d. Gold number
54. The quality of a fuel is indicated by its:
a. Octane number
b. Iodine number
c. Saponification number
d. Gold number
55. The octane number of any fuel is the percentage of iso-octane in a mixture of iso-octane and:
a. n-heptane
b. n-hexane
c. n-butane
d. n.octane
56. Open chain organic compound are called:
a. Alicyclic
b. Aromatic
c. Heterocyclic
d. Aliphatic
57. Which of the following is not heterocyclic compound?
a. Furan
b. Thiophene
c. Pyrole
d. Anthracene
58. The genral formula of saturated alicyclic compound:
a. CnH2n
b. CnH2n-2
c. CnH2n-3
d. C2H2n-2
59. Pyridne is:
a. Aliphatic
b. Heterocyclic
c. Open chain
d. Alicyclic
60. Which one of the following compound does not belong to class of hetero cyclic compounds?
a. Pyridine
b. Furan
c. Quinidine
d. Pyrrole
61. The compounds in which rings consists of atom more than one kind are called:
a. Heterocyclic compounds
b. Homocyclic compounds
c. Alicyclic compounds
d. Aromatic compounds
62. Which one of the followinf set of atoms are called heteroatoms:
a. S,C,O
b. C,N,O
c. N,O,B
d. N,S,O
63. Which one of the following compounds contains sulphur as a heteroatom?
a. Furan
b. Pyrrole
c. Pyridie
d. Thiophene
64. Which one of the following is an aromatic compoud?
a. 1,3,5 cyclohexatriene
b. Cyclopentyne
c. 1,5- cyclohexadiene
d. 1,3-cychlohexadiene
65. Which one of the followinf compounds contains oxygen as a heteroatom?
a. Thiophene
b. Furan
c. Pyridine
d. Pyrrole
66. What type of hybridization is present in cyano:
a. Sp3
b. Sp
c. Dsp
d. Sp2
67. Caroxylic acid is another name of:
a. Ketonic
b. Aldehyde
c. Alcoholic
d. Alkanoic acid
68. Functional group may be:
a. An active part of molecule
b. An atom or a group of atoms
c. A double bond or a triple bond
d. All of given
69. Which one of the following compounds contain mercapto group?
a. C6H5 -OH
b. C2H5 – CN
c. C3H7 -OH
d. CH3 -SH
70. Which one of the following functional group is ot derivative of carbocyl group?
a. Ketone
b. Acid amide
c. Acid halide
d. Ester
71. Due to similar structure, which of the following is considered as water derivative?
a. Ethers
b. Alcohols
c. Phenols
d. All of given
72. How many π-bonds are present in ethane?
a. One
b. Zero
c. Three
d. Two
73. How many σ-bonds are present in methane?
a. 5-σ and 1-π
b. 3-σ and 3-π
c. 6-σ and 0-π
d. 4-σ and 2-π
74. The angle sp-hybridized orbitals is:
a. 109.5o
b. 120o
c. 107.5o
d. 180o
75. The angle between two sp2 -hybridized orbitals is:
a. 120o
b. 109.5o
c. 180o
d. 130o