Class 12th Chemistry Objective Question in English Haloalkanes & Haloarenes Chapter
10. HALOALKANES AND HALOARENES
1. The molecular formula of benzene is :
(A) C6H5
(B) C6H6
(C) C6H12
(D) None of these
| Answer :- (B) |
2. NaOH is:
(A) Acid
(B) Base
(C) Salt
(D) All
| Answer :- (B) |
3. Good conductor of electricity and heat is :
(A) Anthracite coke
(B) Diamond
(C) Graphite
(D) Charcoal
| Answer :- (C) |
4. In which of the following allotropes of carbon, percentage of carbon is maximum ?
(A) Wood charcoal
(B) Coconut charcoal
(C) Graphite
(D) None of these
| Answer :- (C) |
5. The hybridisation of carbon in diamond is :
(A) sp3
(B) sp2
(C) sp
(D) dsp2
| Answer :- (A) |
6. Organic compound must contain an element:
(A) oxygen
(B) carbon
(C) hydrogen
(D) nitrogen
| Answer :- (B) |
7. Alkene gives which of the following reactions ?
(A) Addition reaction
(B) Substitution reaction
(C) Both ‘A’ and ‘B’
(D) None of these
| Answer :- (C) |
8. Single bond length between carbon-carbon is :
(A) 1.34 Å
(B) 1.20 Å
(C) 1.54 Å
(D) none of these
| Answer :- (C) |
9. Valency of carbon is :
(A) 1
(B) 2
(C) 3
(D) 4
| Answer :- (D) |
10. Criteria for purity of organic solid is :
(A) boiling point
(B) melting point
(C) specific gravity
(D) none of these
| Answer :- (B) |
11. General formula of Alkene is :
(A) CnH2n
(B) CnH2n+2
(B) CnH2n-2
(D) None of these
| Answer :- (A) |
12. Hybridisation of carbon in ethane is :
(A) sp3
(B) sp2
(C) sp
(D) sp3d2
| Answer :- (A) |
13. Number of π bonds in ethyne is :
(A) one
(B) two
(C) three
(D) four
| Answer :- (B) |
14. The compound having general formula CnH2n+2 is :
(A) Alkene
(B) Alkyne
(C) Alkane
(D) None of these
| Answer :- (C) |
15. The antiseptic action of CHI3 is :
(A) due to idoform
(B) due to liberation of free iodine
(C) partially due to iodine and partially due to CHI3
(D) None of these
| Answer :- (B) |
16. Which of the following molecules has highest dipole moment?
(A) CH3CI
(B) CH2Cl2
(C) CHCl5
(D) CCl4
| Answer :- (A) |
17. Number of (σ) sigma bonds in CH4 is :
(A) 4
(B) 3
(C) 2
(D) 1
| Answer :- (A) |
18. Ethyl alcohol is obtained when ethyl chloride is boiled with
(A) alcoholic KOH
(B) aqueous KOH
(C) water
(D) aqueous KMnO4
| Answer :- (B) |
19. A Grignard reagent is prepared by the action of magne-sium in dry ether on ?
(A) C2H5OH
(B) C2H6
(C) C2H5Cl
(D) C2H5CN
| Answer :- (C) |
20. Primary, Secondary and Tertiary alcohols are distin-gushied by?
(A) Oxidation method
(B) Lucas reagent method
(C) Victor Meyer’s method
(D) All of these
| Answer :- (D) |
21. Ethyl acetate reacts with Ch3MgBr to from :
(A) Secondry alcohol
(B) Tertiary Alcohol
(C) Primary Alcohol and Acid
(D) Carboxylic Acid
| Answer :- (B) |
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