Q.1
The hydrocarbon which does not decolourise alkaline KMnO4 solution and also does not give any precipitate with ammoniacal silver nitrate is ...[ AIIMS 2007]
  • a) benzene
  • b) acetylene
  • c) propyne
  • d) 1-butyne
Q.2
In methyl alcohol solution bromine reacts with ethylene to yield BrCH2CH2OCH2 in addition to 1,2-dibromoethane because ..[ Pb CEET1998]
  • a) this is a free radical mechanism
  • b) the methyl alcohol sollvates the bromine
  • c) the ion formed initially may react with Br- or CH3OH
  • d) the methyl alcohol solvates the bromine
Q.3
Both methane and ethane may be obtained by a suitable one step reaction from [ BHU 2004]
  • a) CH3I
  • b) CH2CH2I
  • c) CH3OH
  • d) C2H5OH
Q.4
Acetylene when reacts with two molecules of HBr then it gives
  • a) Br-C≡C-Br
  • b) Br-CH=CH-Br
  • c) Br2C-CBr2
  • d) CH3-CHBr2
Q.5
onPassage Based Questions Q277) An acyclic hydrocarbon P, having molecular formula gave acetone as the organic product through the following sequence of reactions, in which Q is an intermediate organic compound ...[IIT 2011] The structure of the compound Q is
ch-23_que_no-277_img_no1.png
  • a)
    ch-23_qn-277choice_img_no1.png
  • b)
    ch-23_qn-277choice_img_no2.png
  • c)
    ch-23_qn-277choice_img_no3.png
  • d)
    ch-23_qn-277choice_img_no4.png
Q.6
n presence of peroxid, hydrogen chloride and hydrogen iodide do not give anti-Markovnikov's addition to alkenes because ..[ IIT2001]
  • a) both are highly ionic
  • b) one is oxidising and the other is reducing
  • c) one of the steps is endothermic in both the cases
  • d) all the steps are exothermic in both the cases
Q.7
When CH3Cl and AlCl3 are used in Friedel-Crafs reaction, the electrophile is ...[ CBSE PMT 1994]
  • a) Cl+
  • b) AlCl4-
  • c) CH3+
  • d) AlCl2+
Q.8
Cyclohexene is best prepared from cyclohexanol by which of the following? [ IIT 2005]
  • a) conc H3PO4
  • b) conc HCl/ ZnCl2
  • c) conc. HCl
  • d) conc. HBr
Q.9
Which is most reactive towards electrophilic reagent? [ AIPMT 2010]
  • a)
    ch-23_qn-281choice_img_no1.png
  • b)
    ch-23_qn-281choice_img_no2.png
  • c)
    ch-23_qn-281choice_img_no3.png
  • d)
    ch-23_qn-281choice_img_no4.png
Q.10
In preparation of alkene from alcohol using Al2O3 which is an effective factor? [ CBSEPMT 2001]
  • a) Temperature
  • b) Concentration
  • c) Porosityof Al2O3
  • d) Surface area of Al2O3
Q.11
on Q283) In the reactions (A) and (B) are geometrical isomers. Then ... [ EAMCET Med. 2007]
ch-23_que_no-283_img_no1.png
  • a) A is cis and B is trans
  • b) A is trans and B is cis
  • c) A and B are cis
  • d) A and B are trans
Q.12
Octane number can be changed by ...[ AFMC 2004]
  • a) isomerissation
  • b) alkylation
  • c) cyclisation
  • d) all of these
Q.13
on Q285) Products of the following reaction [ AMU 2009]
ch-23_que_no-285_img_no1.png
  • a) Me2CO + CH3CHO
  • b) CH3CHO + CH3COOH
  • c) Me2CO + CH3COOH
  • d) 2Me2CO
Q.14
What is the type of reaction CH2 = CHCH3 + HBr → CH3CHBrCH3 ..[ AFMC1999]
  • a) Nucleophilic addition reaction
  • b) Free radical addition reaction
  • c) Electrophilic substitution reaction
  • d) Electrophilic addition reaction
Q.15
Addition of HI to double bond of propene yields isopropyl iodide and not n-propyl iodide as the major product, because addition proceeds through ...[ Haryana CEET 1998]
  • a) a more stable carbonium ion
  • b) a more stable carbanion
  • c) a more stable free radical
  • d) homolysis
Q.16
The correct order of reactivity towards electrophilic substitution is
  • a) phenol > benzene > chlorobenzene > benzoic acid
  • b) benzoic acid > chlorobenzene > benzene > phenol
  • c) phenol > chlorobenzene > benzene > benzoic acid
  • d) benzoic acid > phenol > benzene > chlorobenzene
Q.17
Two gases, P and Q decolourises aqueous bromide but only one of them gives white precipitate with aqueous ammonical silver nitrate solution. P and Q are likely to be ... [ DEC 1994]
  • a) Ethane and ethyne
  • b) But-1-yne and but-2-yne
  • c) Ethane and but-2-yne
  • d) Ethyne and popyne
Q.18
on Q290) The number of optically active products obtained from the complete ozonolysis of the given compound is ...[ IIT 2012]
ch-23_que_no-290_img_no1.png
  • a) 0
  • b) 1
  • c) 2
  • d) 4
Q.19
on Q291) In the following reaction, the product 'R' is [ AFMC 2010]
ch-23_que_no-291_img_no1.png
  • a) benzene
  • b) ethylbenzene
  • c) toluene
  • d) n-propyl benzene
Q.20
Pure methane can be produced by ... [ DEC 2001]
  • a) Wurtz reaction
  • b) Kolbe's electrolysis method
  • c) Soda-lime decarboxylation
  • d) Reduction with H2
Q.21
Which of the following reagents, when heated withethyl chloride, forms ethylene? [ AFMC 2008]
  • a) Aqueous KOH
  • b) Zn/HCl
  • c) Alcohol KOH
  • d) HI
Q.22
Which of the following will be most easily attacked by an electrophile..[CBSE PMT 1999]
  • a)
    ch-23_qn-294choice_img_no1.png
  • b)
    ch-23_qn-294choice_img_no2.png
  • c)
    ch-23_qn-294choice_img_no3.png
  • d)
    ch-23_qn-294choice_img_no4.png
Q.23
Chloroform or iodoform on heating with silver powder gives ..[ CET J&K 2011]
  • a) CH4
  • b) C2H4
  • c) C2H6
  • d) C2H2
Q.24
Tolune reactswith methyl chloride in presence of anhydrous aluminium chloride to give mainly m-xylene. This is because
  • a) CH3-group is m-directing
  • b) CH3-group has +I effect
  • c) because of hyperconjugation effect of the CH3-group
  • d) m-xylene isthermodynamically more stableInitially formed o- and p-xylenes under the reaction condition are converted into thermodynamically morestable m-xylene
Q.25
ion and Reason Q297) Statement I : Addition of bromine to trans-2-butene yields meso-2,3-dibromobutane. Statement II : Bromine addition to an alkene is an electrophilic addition
  • a) Statement I is correct Statement II is correct Satement II is a correct explanation of statement I
  • b) Statement I is correct statement II is correct statement II is not the correct explanation of statement I
  • c) Statement I is correct, statement II is incorrect
  • d) Statement I is incorrect statement II is correct
Q.26
Decarboxylation of isobutyric acid leads to ...
  • a) Iso - Butane
  • b) Propane
  • c) Butane
  • d) None of these
Q.27
The hydrocarbon which decolourises alkaline KMnO4 solution, but does not give any precipitate with ammonical silver nitrate is ...[ AIIMS 1994]
  • a) Benzene
  • b) Acetylene
  • c) Propyne
  • d) Butyne-2
Q.28
Which compound would give 5-keta-2-methyl hexanal upon ozonilysis? [ IIT 2015]
  • a)
    ch-23_qn-300choice_img_no1.png
  • b)
    ch-23_qn-300choice_img_no2.png
  • c)
    ch-23_qn-300choice_img_no3.png
  • d)
    ch-23_qn-300choice_img_no4.png
Q.29
Reaction of HBr with propene in absence of peroxide is a/an ...[ Kerala PMT 2011]
  • a) electrophilic addition
  • b) electrophilic substitution
  • c) nucleophilic substitution
  • d) free radical addition
Q.30
In the free radical chlorination of methane, the chain initiation step involves the formation ...[ CBSE PMT 1994]
  • a) Chlorine atom
  • b) Hydrogen chloride
  • c) Methyl radical
  • d) Chloromethyl radical
0 h : 0 m : 1 s