12th class (Fsc) Chemistry unit 8 MCQs
chapter 8 MCQs 12th Class Chemistry
Aliphatic Hydrocarbons:
1. General formula of alkane is:
a. CnH2n+2
b. CH4
c. CnH2n-3
d. CnH2n-2
2. General formula of alkyl is:
a. CnH2n-2
b. CnH2n+1
c. CnH2n
d. CnH2n+2
3. Hydrocarbons contain:
a. C,N,O
b. C,H,O
c. C,H,N,S
d. C,H
4. Hybridization of tetrehedral geometry is:
a. Sp
b. Sp3
c. Dsp2
d. Sp2
5. A tertiary carbon is bonded directly to:
a. 2 carbons
b. 4 carbons
c. 4 hydrogen
d. 3 carbons
6. Compounds of carbon and hydrogen in which tetra valency of carbon is fully satisfied are called:
a. Magnetic hydrocarbons
b. Saturated hydrocarbons
c. Paramagnetic hydrocar
d. Unsaturated hydrocarbons
7. Compounds of carbon and hydrogen which contain either double or triple bond is called:
a. Magnetic hydrocarbons
b. Saturated hydrocarbons
c. Paramagnetic hydrocar
d. UNsaturated hydrocarbons
8. Ghee is:
a. Hydrogenolysis
b. Saturated H.C
c. Monoyness
d. Unsaturated H.C
9. Oil is:
a. Polymerization
b. Saturated H.C
c. Di ynes
d. Unsaturated H.C
10. Sp3 hybridization occurs when carbon is bonded to:
a. Two atoms
b. Four atoms
c. One atom
d. Three atoms
11. Compare combustion of an alkanes yields:
a. H2O + heat
b. CO2+H2O + heat
c. Only heat
d. CO2 + heat
12. Incomplete oxidation of an alkane yields:
a. CO2+H2O + heat
b. C+CO+H2 O + heat
c. C+H2O + heat
d. CO+H2O + heat
13. Catalytic oxidation of methane in the presence of Cu as catalyst at 400oC. under 200 atmospheric prssure yields:
a. Formic acid
b. Methyl alcohol
c. Formaldeyde
d. All the three
14. A reaction catalyzed by the presence of sunlight is called:
a. Chemical reaction
b. Light reaction
c. Photochemical reaction
d. Dark reaction
15. The order reactivity with alkanes is:
a. Br2>Cl2>l2>l2
b. F2>Cl2>Br2>l2
c. l2>Br2>Cl2>F2
d. None of these
16. Free radical mechanism in the halogenations involves:
a. Termination step
b. Intitiation step
c. Propagation step
d. All of these
17. …… is the major reaction in engines of automobiles:
a. Nitration
b. Hydrogenation
c. None of these
d. Combustion
18. The catalytic oxidation of alkane is used:
a. In organic synthesis
b. To prepare higher fatty acids
c. As fuel
d. All
19. Nitro alkanes are used:
a. As solvents
b. To prepare higher fatty acids
c. As fuel
d. Both a and c
20. Electrolysis of disodium succinate:
a. Ethyne
b. Ethane
c. Phenyl
d. Ethene
21. 2-Butanol gives by dehydration:
a. 1-butanol
b. 1-butene
c. 2-butanol
d. 2-butene
22. What products are formed. when dehydration of 2-methyl-2- butanol:
a. 1-methyl-2- butane
b. 2-methyl-2- butane
c. 3-methyl-1- butane
d. 2-methyl-1- butane
23. Dehydro halogenation of 2-bromopropane gives:
a. Propyne
b. 1-propene
c. Propanone
d. Propane
24. Dehydrohalogenation of 2-bromo-3-sethylbutane:
a. 3-methyl-3- butene
b. 2-methyl-3- butene
c. 3-methyl-2- butene
d. 2-methyl-2- butene
25. Vic-dihalides on treatment with zinc dust give:
a. Alkanes
b. Alkenes
c. All of them
d. Alkyens