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Class 12 Chemistry
Haloalkanes And Haloarenes
Quiz 1
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Good conductor of electricity and heat is
0%
Anthracite coke
0%
Diamond
0%
Graphite
0%
Charcoal
Explanation
Graphite
In which of the following allotropes of carbon, percentage of carbon is maximum?
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Wood charcoal
0%
Coconut charcoal
0%
Graphite
0%
None of these
Explanation
Graphite
Organic compound must contain an element
0%
oxygen
0%
carbon
0%
hydrogen
0%
nitrogen
Explanation
carbon
Alkene gives which of the following reactions?
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Addition reaction
0%
Substitution reaction
0%
Both (a) and (b)
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None of these
Explanation
Both (a) and (b)
Single bond length between carbon-carbon is
0%
1.34 Å
0%
1.20 Å
0%
1.54 Å
0%
none of these
Explanation
1.54 Å
Valency of carbon is
0%
1
0%
2
0%
3
0%
4
Explanation
4
Criteria for purity of organic solid is
0%
boiling point
0%
melting point
0%
specific gravity
0%
none of these
Explanation
melting point
Hybridisation of carbon in ethane is
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sp
0%
ps
0%
(i) and (ii)
0%
None of the above
Explanation
sp
Number of π bonds in ethyne is
0%
1
0%
2
0%
3
0%
4
Explanation
2
The compound having general formula CH is
0%
Alkene
0%
Alkyne
0%
Alkane
0%
none of these
Explanation
Alkane
The negative part of the addendum (the molecule to be added) adds on the carbon atom of the double bond containing the least number of hydrogen atoms. This rule is known as
0%
Saytzeffs rule
0%
Peroxide rule
0%
Markovnikov’s rule
0%
van’t hoff rule
Explanation
Markovnikov’s rule
Which of the following compounds can yield only one monochlorinafed product upon free radical chlorination?
0%
2, 2-Dimethylpropane
0%
2-Methylpropane
0%
2-Methylbutane
0%
n-Butane
Explanation
2, 2-Dimethylpropane
The reaction
0%
nucleophilic addition
0%
free radical addition
0%
electrophilic addition
0%
electrophilic substitution
Explanation
electrophilic addition
Bromination of methane in presence of sunlight is a
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nucleophilic substitution
0%
free radical substitution
0%
electrophilic substitution
0%
nucleophilic addition
Explanation
free radical substitution
The reaction of toluene with chlorine in presence of FeCl
0%
amixture of o-and p-chlorotoluene
0%
benzyl chloride
0%
m-chlorotuluene
0%
benzoyl chloride
Explanation
amixture of o-and p-chlorotoluene
Alkyl halides are immiscible in water though they are polar because
0%
they react with water to give alcohols
0%
they cannot form hydrogen bonds with water
0%
C -X bond cannot be broken easily
0%
they are stable compounds and are not reactive
Explanation
they cannot form hydrogen bonds with water
Which of the following compounds will have highest melting point?
0%
Chlorobenzene
0%
o-Dichlorobenzene
0%
m-Dichlorobenzene
0%
p-Dichlorobenzene
Explanation
p-Dichlorobenzene
Ethyl alcohol is obtained when ethyl chloride is boiled with
0%
alcoholic KOH
0%
aqueous KOH
0%
water
0%
aqueous KMnO
Explanation
aqueous KOH
Butane nitrile can be prepard by heating.
0%
propyl alcohol with KCN
0%
butyl chloride with KCN
0%
butyl alcohol with KCN
0%
propyl chloride with KCN
Explanation
propyl chloride with KCN
Which of the following reactions will give the major and minor products?
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is major product and (b) is minor product
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(a) is minor product and is major product
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Both (a) and (b) are major products
0%
Only (b) is formed and (a) is not formed
Explanation
(a) is major product and (b) is minor product
0 h : 0 m : 1 s
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