12th class (Fsc) Chemistry unit 8 MCQs
26. Catalyst used for partial hydrogenation of alkynes is:
a. Quinoline
b. Ni
c. None of these
d. Pb
27. The formula of Lindlar;s catalyst is:
a. Pd(NeSO4)
b. Ba/pbSO4
c. None of these
d. Pd(BaSO4)
28. Ethene, propene and butane are …… at room temperature:
a. Solids
b. Gases
c. Liquids
d. None of these
29. Hydrogen halides give addition reaction with ethene to form:
a. Ethyl halide
b. Ethyl alcohol
c. Ethyl hydride
d. Ethyl oxide
30. The addition of H2O to a molecule is called:
a. Dehydration
b. Hydrogenation
c. Hydration
d. Hydrocylation
31. On passing ethene into concentrated H2SO4 the intermediate compound formed on hydrolysis with boiling water gives:
a. Ethyl hydrogen sulphate
b. Methyl alcohol
c. Methyl hydrogen sulphates
d. Ethyl alchohol
32. The addtion of X2 to an alkene molecule is called:
a. Halogenation
b. Hydrogenation
c. Hydration
d. Hydroxylation
33. What happens when bromine is added in ethene?
a. H-Br if formed
b. Epoxide is formed
c. None of these
d. Vicinal dihalide is formed
34. The molecule of the type HOX are called:
a. Hypohalous
b. Hypohalous acid
c. Hypohalous
d. Hydroxy halide
35. 2-chloroethanol is formed when ethylene reacts with:
a. CI2
b. HCL
c. CHCI3
d. HOCL
36. The catalyst used for epocide formation from alkene is:
a. Ag
b. Zn
c. Ni
d. Cu
37. Bayer’s test is used to detect:
a. Unstauration
b. Saturation
c. Polumerization
d. None of these
38. When a compound (X) is passed through dilute alkaline KMnO4 solution the pink color of solution is discharged. The compound (X) is:
a. Benzene
b. Methane
c. Ethene
d. Ethane
39. Combustion of an alkene wth sufficient O2 will produce:
a. CO2+H2O
b. CO
c. CO+H2O
d. CO2
40. The raney nickel is prepared by treating …… with NaOH:
a. Ni-pb
b. Ni-AI
c. Ni-Ag
d. Ni-Cu
41. The addition of H2 to a molecule is called:
a. Dehydration
b. Hydrogenation
c. Hydration
d. Hydroxylation
42. Catalytic hydrogenation of 3-methyl-1-butene gives:
a. 2-methyl butane
b. Isobutane
c. 3-methyl butane
d. 2,2-dimethyl butane
43. The addition of HX to a molecular is called:
a. Dehydration
b. Hydrogenation
c. Hydrohalogenation
d. Hydroxylation
44. Addition of HBr to propene gives:
a. 1-bromo propane
b. 2-bromo propane
c. both a and b
d. None of these
45. In the reaction of propene with HCI,H+ ion acts as the:
a. Carbonium ion
b. Electrophile
c. Carbanion
d. Nucleophile
46. Ozene is representes as:
a. O3
b. O2
c. O
d. O4
47. Ethene when heated to 400 C and 100 atmospheric pressure in, the presence of 0.1% oxygen gives:
a. Ethyne
b. Methane
c. Polyethylene
d. Ethane
48. The general formula of alkynes is:
a. CnH2n+1
b. CnH2n
c. CnH2n-2
d. CnH2n+2
49. In acerylene, the carbon atom is:
a. Sp hybridized
b. Sp3 hybridized
c. Dsp3 hybridized
d. Sp2 hybridized
50. Identify which of the following compound contains a triple bond:
a. Alkyne
b. Alkane
c. Benzene
d. Alkene