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NEET Chemistry MCQ
Haloalkanes And Haloarenes Mcq Neet Chemistry
Quiz 4
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Q.1
The reagent used for dehalogenation of 1,2-dichloropropane is
0%
a) Zn dust
0%
b) Zn-Hg
0%
c) Na
0%
d) Zn-Cu couple
Explanation
Answer:(a)
Q.2
At higher temperature, iodoform reaction is given by
0%
a) CH3COOCH3
0%
b) CH3COOC6H5
0%
c) C6H5COOCH3
0%
d) CH3COOC2H5
Explanation
Answer:(d)
Q.3
A small amount of alcohol is usually added to CHCl3 bottles because
0%
a) it retards the oxidation of CHCl3 to phosgene
0%
b) it retards the anaesthetic property of CCH3
0%
c) both (b) and (c)
0%
d) it convers any phosgene formed to harmless ethyl carbonate
Explanation
Answer:(c)
Q.4
Which compound on reaction with ethyl magnesium bromide and water will form 2-methyl-2-butanol?
0%
a) C2H5COCH3
0%
b) CH3COOCH3
0%
c) CH3COCH3
0%
d) CH3CH2CHO
Explanation
Answer:(c)
Q.5
CH3NH2 reacts with CH3MgX to give
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a) Ethane
0%
b) Methane
0%
c) Ethanol
0%
d) Methanol
Explanation
Answer:(b)
Q.6
Which of the following can be obtained by halide exchange method
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a) CH3I
0%
b) CH3Cl
0%
c) C2H5Cl
0%
d) CH3Br
Explanation
Answer:(a)
Q.7
Strong reducing agent converts CHCI3 into
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a) CH4
0%
b) C2H6
0%
c) C2H4
0%
d) C2H2
Explanation
Answer:(a)
Q.8
Ethyl bromide and isopropyl chloride can be distinguished by
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a) alcoholic AgNO3
0%
b) comparing their colours
0%
c) burning the compound on spatual
0%
d) aqueous KOH
Explanation
Answer:(a)
Q.9
Preparation of alkyl halids in laboratory is least preferred by
0%
a) halide exchange
0%
b) treatment of alcohol
0%
c) addition of hydrogen halides to alkenes
0%
d) direct halogenation of alkanes
Explanation
Answer:(d)
Q.10
PVC plastics are produced by the polymerization of
0%
a) allyl chloride
0%
b) vinyl chloride
0%
c) vinyl acetate
0%
d) ethene
Explanation
Answer:(b)
Q.11
The product obtained on treatment of ethyl chloride with potassium cyanide is reduced by sodium and alcohol to give
0%
a) propyl amine
0%
b) ethyl amine
0%
c) diethyl amine
0%
d) acetic acid
Explanation
Answer:(a)
Q.12
Methyl bromide is not used
0%
a) for dyeing cloths
0%
b) as an insecticide
0%
c) as disinfectant
0%
d) as disinfectant for young fruit trees
Explanation
Answer:(a)
Q.13
Which of the following is gem-dihalide?
0%
a) CH3CHBr2
0%
b) BrCH2CH2Br
0%
c) CH3CHBrCH2Br
0%
d) CH3CHBrCH2CH2CH2Br
Explanation
Answer:(a)
Q.14
PCl5 reacts with propanone, to give
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a) propanol
0%
b) propanal
0%
c) propane chloride
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d) gem dichloride
Explanation
Answer:(d)
Q.15
Grignard reagent with hydrogen cyanide gives
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a) aldehyde
0%
b) ketone
0%
c) alcohol
0%
d) both (a) and (b)
Explanation
Answer:(d)
Q.16
Alkyl halides on treatment with a suspension of Ag2O moist in ether gives
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a) alkanol
0%
b) alkanal
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c) alkanes
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d) alkoxy alkane
Explanation
Answer:(d)
Q.17
When iodoform is heated with silver powder it forms
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a) acetaldehyde
0%
b) ethane
0%
c) ethylene
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d) acetylene
Explanation
Answer:(d)
Q.18
Benzene on reaction with a mixture of HNO3 and H2SO4 follod by reaction of Cl2/FeCl3 gives
0%
a) 2-chloro-1-nitrobenzene
0%
b)3-chloro-1-nitrobenzene
0%
c) 4-chloro-1nitrobenzne
0%
d) none of the above
Explanation
Answer:(b)
Q.19
A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH, it gives
0%
a) isopropylalcohol
0%
b) isopropylene
0%
c) 1-propene
0%
d) 2-propene
Explanation
Answer:(c)
Q.20
If methyl iodide and ethyl iodide are mixed in equal proportions, and the mixture is treated with metallic sodium in presence of dry ether, the number of possible products formed is
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a) 1
0%
b) 2
0%
c) 3
0%
d) 4
Explanation
Answer:(c)
Q.21
Which statement is wrong about chloroform?
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a) Chloroform has sp3 hybridised carbon atom
0%
b) Chloroform has sp2 hybridised carbon atom
0%
c) Chloroform is used as solvant
0%
d) Chloroform hass distorted tetrahedral shape
Explanation
Answer:(b)
Q.22
Which reagent is useful in increasing the carbon chain of an alkyl halide
0%
a) HCN
0%
b) KCN
0%
c) NH4CN
0%
d) AgCN
Explanation
Answer:(b)
Q.23
Sodium ethoxide reacts with ethyl iodide to give
0%
a) C2H5I
0%
b) CH3CH3
0%
c) C2H5OC2H5
0%
d) C2H5OH
Explanation
Answer:(c)
Q.24
The combination which produces t- butyl alcohol when treatment with Grignard reagent
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a) CH3MgBr + CH3COCH3
0%
b) C2H5MgBr + CH3COCH3
0%
c) CH3MgBr + (CH3)2CHOH
0%
d) CH3MgBr + (CH3)3COH
Explanation
Answer:(a)
Q.25
1-phenyl, 2-chloropropane on treating with alc.KOH gives mainly
0%
a) 1-phenylpropene
0%
b) 2-phenylpropene
0%
c) 1-phenylpropan-2-ol
0%
d) 1-phenylpropan-1-ol
Explanation
Answer:(a)
Q.26
Ethyl dichloride can be prepared by adding HCl to
0%
a) ethylene
0%
b) ethane
0%
c) acetylene
0%
d) ethylene glycol
Explanation
Answer:(d)
Q.27
Assertion: n-butyl chloride has lower b.p. than n-butyl bromide Reason: The b.p. increases with with increase in molar mass
0%
a) Assertion is correct but Reason is wrong
0%
b) Assertion is wrong but Reason is correct
0%
c) Both Assertion and Reason are correct and Reason is correct explanation of Assertion
0%
d) Both Assertion and Reason are correct but Reason is not correct explanation of Assertion
Explanation
Answer:(c)
Q.28
The CCl4 and CHCl3 can be distinguished
0%
a) RNH2 + KOH alc
0%
b) RCN + KOH alc
0%
c) Hydrolysis
0%
d) burning in air
Explanation
Answer:(a)
Q.29
The reagent used in the conversion of 1-butanol to 1-bromobutane is
0%
a) CHBr3
0%
b) Br2
0%
c) CH3Br
0%
d) P + Br2
Explanation
Answer:(d)
Q.30
Formation of alkane by the action of Zn on alkyl halide is called
0%
a) Wurtz reaction
0%
b) Frankland's reaction
0%
c) Kolbe's reaction
0%
d) Cannizzaro's reaction
Explanation
Answer:(b)
0 h : 0 m : 1 s
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