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Question Bank No: 1

1. A fuel has the same knocking property as a mixture of 70% isooctane(2,2,4- trimethyl pentone) and 30% n-heptone by volume. The octone number of the fuel is

a)		100
b)		70
c)		50
d)		30

2. Hydrocarbon which is liquid at room temperature is

a)		Pentane
b)		Butane
c)		Propane
d)		Ethane

3. Propyne and propene can be distinguished by

a)		${dCl . KMnO}_{4}$
b)		Conc. $H_{2} {SO}_{4}$
c)		Ag ${NO}_{3}$ in ${NH}_{3}$
d)		${Br}_{2}$ in CC $l_{4}$

4. Which of the following method is most appropriate for the manufacture of methane?

a)		By reduction of ${CH}_{2} {Cl}_{2}$
b)		Wurtz reaction
c)		Liquification of natural gas
d)		None of these

5. Which of the following has highest octone number

a)		n- Hexane
b)		n- Heptane
c)		n- Pentane
d)		2,2,4-Trimethylpentane

6. A gas decolourises alkaline ${KMnO}_{4}$ solution but does not give precipate with ${AgNO}_{3} .$ It is

a)		C $H_{4}$
b)		$C_{2} H_{4}$
c)		$C_{2} H_{2}$
d)		$C_{2} H_{6}$

7. The principal organic product formed in the reaction ${CH}_{2} = CH (C H_{2})_{8} COOH + HBr \overset{peroxide}{⟶}$ is

a)		${CH}_{3} - CHBr (C H_{2})_{8} COOH$
b)		${CH}_{2} - CH (C H_{2})_{8} COBr$
c)		${CH}_{2} Br {CH}_{2} (C H_{2})_{8} COOH$
d)		${CH}_{2} = CH (C H_{2})_{7} CHBr COOH$

8. The function of Al ${Cl}_{3}$ in Friedal Craft's reaction is

a)		to absorb water
b)		to absorb HCl
c)		to produce electrophile
d)		to produce nucleophile

9. Addition of HI on double bond of propene yields isopropyl iodide as major product. It is because the addition proceeds through

a)		More stable carbocation
b)		More stable carbanion
c)		More stable free radical
d)		Homolysis

10. An unknown compound A has a molecular formula $C_{4} H_{6} .$ When A is treated with excess of B $r_{2}$ a new substance B with formula $C_{4} H_{6} {Br}_{4}$ is formed. A forms a white ppt. with ammonical silver nitrate solution. A may be

a)		But -1-yne
b)		But -2-yne
c)		But -1-ene
d)		But -2-yne

11. Reaction of benzene with alkyl halide in the presence of anhydrous ${AlCl}_{3}$ is called

a)		Friedal- Craft reaction
b)		Wurtz reaction
c)		Williamson's synthesis
d)		Baeyer's reaction

12. Which one of these is not compatible with arenes?

a)		Greater stability
b)		Resonance
c)		Electrophilic addition
d)		Delocalisation of $π -$ electrons

13. The product formed on passing ethylene through a cold alkaline ${KM nO}_{4}$ solution is

a)		Ethyl alcohol
b)		Ethylene glycol
c)		Ethylene oxide
d)		Ethane

14. When ethylbromide and n- propyl bromide is allowed to react with sodium , in ether, they form

a)		Single alkane
b)		Mixture of two alkanes
c)		Mixture of three alkanes
d)		Mixture of four alkanes

15. $C_{3} H_{8} + {Cl}_{2} \overset{Light}{⟶}$ $C_{3} H_{7} Cl + HCl$
The above reaction is an example of

a)		Elimination
b)		Substitution
c)		Addition
d)		Rearrangement

16. Acetylene gives

a)		White ppt. with ammonical ${AgNO}_{3}$ and red ppt. with ammonical ${Cu (NO}_{3})_{2}$
b)		White ppt. with ammonical ${AgNO}_{3}$ and red ppt. with ammonical ${Cu}_{2} {Cl}_{2}$
c)		White ppt with both
d)		Red ppt with both

17. ${CH}_{3} - C \equiv C - {CH}_{3} ⟶_{(ii) Zn / H_{2} O}^{(i) X}$ ${CH}_{3} - \underset{\underset{O}{∥}}{C} - \underset{\underset{O}{∥}}{C} - {CH}_{3}$
In the above reaction X is

a)		${HNO}_{3}$
b)		$O_{2}$
c)		$O_{3}$
d)		${KMnO}_{4}$

18. When acetylene is treated with very dilute HCl in the presence of ${HgCl}_{2}$ ,the product obtained is

a)		Methyl Chloride
b)		Acetaldchyde
c)		Vinyl chloride
d)		Formaldehyde

19. Which of the following on reaction with ${KM nO}_{4} / H_{2} S O_{4}$ gives acetone?

a)		Ethene
b)		Butyne
c)		2,3-Dimethyl-2-butene
d)		2-Butene

20. Which of the following catalyst is used for preparing toluene by reacting benzene with methyl chloride?

a)		Ni
b)		Anhydrous ${AlCl}_{3}$
c)		Pd
d)		Pt

21. 1, 3-Butadiene when treated with ${Br}_{2}$ gives

a)		1,4-Dibromo-2-butene
b)		1,3-Dibromo-2-butene
c)		3,4-Dibromo-1-butene
d)		2,3-Dibromo-2-butene

22. The addition of HBr is easiest with

a)		${CH}_{2} = CHCl$
b)		$ClCH = CHCl$
c)		${CH}_{3} - CH = {CH}_{2}$
d)		${{(CH}_{3})}_{2} C = {CH}_{2}$

23. Which 2-butyne is treated with dil. $H_{2} {SO}_{4} / {HgSO}_{4}$ , the product formed is

a)		Butanol-1
b)		Butanone
c)		2-Butanol
d)		Butanoic acid

24. In benzene molecule the carbon atoms are inclined at an angle of

a)		$120^{\circ}$
b)		$180^{\circ}$
c)		$109^{\circ} 28'$
d)		$60^{\circ}$

25. Which of the following species participate in sulphonation of benzene ring?

a)		$H_{2} {SO}_{4}$
b)		${HSO}_{3}^{-}$
c)		${SO}_{3}$
d)		${SO}_{2}^{-}$

26. Octane number is zero for

a)		n-Heptane
b)		Isooctane
c)		n-Hexane
d)		Isoheptane

27. A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group towards o- and p- positions is

a)		${- NH}_{2}$
b)		$- Cl$
c)		${- NO}_{2}$
d)		${- C}_{2} H_{5}$

28. Among the following compounds which is most reactive towards nitration

a)		Benzene
b)		Nitrobenzene
c)		Toluene
d)		Chlorobenzene

29. A gas decolourises bromine in ${CCl}_{4}$ and forms a precipitate with ammonical silver nitrate. The gas is

a)		$C_{2} H_{2}$
b)		$C_{2} H_{4}$
c)		$C_{2} H_{6}$
d)		${CH}_{4}$

30. In Wurtz reaction the reagent used is

a)		Na
b)		Na/liq. ${NH}_{3}$
c)		Na/dry ether
d)		Na/dry alcohol

31. Both methane and ethane can be prepared in one step by the reaction of

a)		$C_{2} H_{4}$
b)		${CH}_{3} OH$
c)		${CH}_{3} Br$
d)		${CH}_{3} {CH}_{2} OH$

32. In which of the following molecules hydrogen is more acidic?

a)		Acetylene
b)		Methane
c)		Ethane
d)		Ethylene

33. Formation of polythene from calcium carbide takes place as follows
${CaC}_{2} + {2 H}_{2} O \to {Ca (OH)}_{2} + C_{2} H_{2}$ ;
$C_{2} H_{2} + H_{2} \to C_{2} H_{4}$ ;
${n C}_{2} H_{4} \to (- {CH}_{2} - {CH}_{2} -) n$
The amount of polythene obtained from 64kg of ${CaC}_{2}$ is

a)		7kg
b)		14kg
c)		21kg
d)		28kg

34. Adding ${Cl}_{2}$ to benzene in the presence of anhydrous ${AlCl}_{3}$ is an example of

a)		Addition
b)		Elimination
c)		Substitution
d)		None of these

35. Benzene does not undergo addition reaction easily because

a)		It has a cyclic structure
b)		Double bonds in it are very strong
c)		Resonance stabilized system is to be preserved
d)		It has six hydrogen atoms

36. The presence of unsaturation in organic compounds can be tested with

a)		Schiff's reagent
b)		Tollen's reagent
c)		Fehling's reagent
d)		Baeyer's reagent

37. Which one of the following reagents distinguish ethylene from acetylene?

a)		Aqueous alkaline ${KMnO}_{4}$
b)		${Cl}_{2}$ dissolved in ${CCl}_{4}$
c)		Ammonical ${Cu}_{2} {Cl}_{2}$
d)		Conc. $H_{2} {SO}_{4}$

38. Most common reactions of benzene and its derivatives are

a)		electrophilic addition reactions
b)		electrophilic substitution reactions
c)		nucleophilic addition reactions
d)		nucleophilic substitution reactions

39. Necessary conditions for halogenation of benzene are

a)		cold and dark
b)		presence of halogen carrier
c)		both
d)		none

40. The function of anhydrous ${AlCl}_{3}$ in Friedal Craft reaction is

a)		to absorb water
b)		to absorb HCl
c)		to produce attacking electrophile
d)		to produce nucleophile