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Mere Teacher · Previous Year Questions
NEET Chemistry · Haloalkanes & Haloarenes · Set 7 (Q181-210)
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181.
Chlorination of ethane is carried out in presence of
(1)anhydrous AlBr3
(2)mercuric chloride
(3)ultraviolet light
(4)zinc chloride.
182.
The arrangement of following compounds: (i) bromomethane (ii) bromoform (iii) chloromethane (iv) dibromomethane In the increasing order of their boiling point is
(1)iv < iii < i < ii
(2)i < ii < iii < iv
(3)iii < i < iv < ii
(4)ii < iii < i < iv
183.
Reactivity order of halides for dehydrohalo genation is
(1)R−F>R−Cl>R−Br>R−I
(2)R−I>R−Br>R−Cl>R−F
(3)R−I>R−Cl>R−Br>R−I
(4)R−F>R−I>R−Br>R−Cl
184.
The major product C of the following reaction sequence will be
(1)
(2)
(3)
(4)
185.
The correct options for the products A and B of the following reactions are :
(1)
(2)
(3)
(4)
186.
An alkyl bromide (X) reacts with sodium in ether to form 4, 5-diethyloctane, the compound ' X ' is
(1)CH3(CH2)3Br
(2)CH3(CH2)5Br
(3)CH3(CH2)3CH(Br)CH3
(4)CH3−(CH2)2−CH(Br)−CH2−CH3
187.
Benzene can be conveniently converted into n-propy? benzene by
(1)Friedel-Crafts alkylation with n-propyl chloride
(2)Friedel-Crafts acylation with propionyl chloride followed by Wolff-Kishner reduction
(3)Friedel-Crafts acylation with propionyl chloride followed by catalytic hydrogenation
(4)Friedel-Crafts acylation with propionyl chloride followed by reduction with LiAlH4.
188.
Identify X and Y in the following reaction CH2=CH2→(i)X(ii)YCH3CH2I
(1)HBr,NaI/ dry CH3COCH3
(2)HBr,I2/ dry CH3COCH3
(3)Br2,NaI/ dry CH3COCH3
(4)Br2,I2/ dry CH3COCH3
189.
The products A and B in the following reactions, respectively are A⟷Ag−NO2CH3−CH2 CH2−Br→AgCNB
(1)CH3−CH2−CH2−NO2,CH3−CH2−CH2−CN
(2)CH3−CH2−CH2−ONO,CH3−CH2−CH2−NC
(3)CH3−CH2−CH2−ONO,CH3−CH2−CH2−CN
(4)CH3−CH2−CH2−NO2,CH3−CH2−CH2−NC
190.
In SN2 reaction, the carbon in the transition state is
(1)Tri coordinated
(2)Penta coordinated
(3)Tetra coordinated
(4)Hexa coordinated
191.
The major product of the following reaction is : (i)aq.NaOH(ii)CH3I
(1)
(2)
(3)
(4)
192.
Heating of 2 -chloro- 1 -phenylbutane with EtOK/EtOH givesX as the major product. Reaction of X with Hg(OAc)2/H2O followed by NaBH4 gives Y as the major product. Y is:
(1)
(2)
(3)
(4)
193.
Which of the following compounds has zero dipole moment?
(1)1,4-dichlorobenzene
(2)1,2-dichlorobenzene
(3)1,3-dichlorobenzene
(4)1-chloro-2-methyl benzene
194.
A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is
(1)1,1-dibromopropane
(2)2,2-dibromobutane
(3)1,2-dibromoethane
(4)1,4-dibromobutane.
195.
1,2-dibromocyclooctane (i)KOH(alc.)(ii)NaNH2(iii)H+Hg2+(iv)Zn−Hg/H+Pmajorproduct 'P' is
(1)
(2)
(3)
(4)
196.
1-methyl-ethylene oxide HBrexcessX Product ’X’ will be
(1)
(2)
(3)
(4)
197.
Which one of the following reactions will not lead to the desired ether formation in major proportion? (iso- Bu⇒ isobutyl, sec- Bu⇒ sec-butyl, nPr⇒ n-propyl,tBu⇒ tert-butyl, Et⇒ ethyl)
(1)
(2)iso- BuONa++sec−BuBr⟶ sec-Bu−O− iso -Bu
(3)
(4)tBuON+a+EtBr→tBu−O−Et
198.
Assertion (A) : SN1 hydrolysis of optically active 2-bromooctane results in the formation of ( ± ) - octane -2 -ol.Reason (R) : The reaction proceeds through a planar carbocation which can be attacked by the nucleophile from either side.The correct answer is
(1)(A) and (R) are correct, (R) is the correct explanation of (A)
(2)(A) and (R) are correct but (R) is not the correct explanation of (A)
(3)(A) is correct but (R) is not correct
(4)(A) is not correct but (R) is correct
199.
The major product obtained in the reaction of bromobenzene with Mg in dry ether followed by the reaction with benzonitrile and hydrolysis is
(1)acetophenone
(2)benzophenone
(3)phenyl benzoate
(4)benzoic acid
200.
In the following reaction, C6H5CH2Br1. Mg, Ether2. H3O+X,the product‘X’ is
(1)C6H5CH2OCH2C6H5
(2)C6H5CH2OH
(3)C6H5CH3
(4)C6H5CH2CH2C6H5
201.
The major product of the following reaction is : AlCl3,∆
(1)
(2)
(3)
(4)
202.
In the following sequence of reaction, the major products B and C respectively are :
(1)
(2)
(3)
(4)
203.
The rate of reaction of t-butyl bromide and NaOH in water depends on the concentration of
(1)Both t-butyl bromide & NaOH
(2)NaOH
(3)Independent of concentration
(4)t-butyl bromide
204.
The major product of the following reaction is : Br2(excess)
(1)
(2)
(3)
(4)
205.
Identify ' Z ' in the following reaction sequence 2C3H7Br→Na/EtherX→Mo2O3773k10−20atmY→Anh.AlCl3CH3ClZ
(1)
(2)
(3)
(4)
206.
The major product of the above reaction is
(1)
(2)
(3)
(4)
207.
The major product of the following reaction is
(1)CH3−C(CH3)(H)−CH=CH2
(2)CH3−C(CH3)=CHCH3
(3)CH3−C(CH3)(OCH3)−CH2CH3
(4)CH3−C(CH3)(H)−CH(OCH3)CH3
208.
Identify B formed in the reaction. Cl−(CH2)4−Clexcess NH3ANaOHB+H2O+NaCl
(1)
(2)H2N−(CH2)4−NH2
(3)Cl+H3−(CH2)4−N+H3Cl−
(4)
209.
The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethyl benzene from benezene is:
