Q.1.
One mole of an unsaturated hydrocarbon on ozonolysis gives one mole each of CH3CHO, HCHO and OHC-CHO. The hydrocarbon is ..[ PMT kerala 2006]
-
14%
a) CH3CH2 - C ≡ C - CH3
-
14%
b) HC ≡ C - CH2CH2CH3
-
71%
c) CH3CH = CHCH = CH2
-
0%
d) H2C=C=CHCH2CH3
Explanation
Q.2.
on Q304) In the followingreaction what is X
-
0%
a) CH3CH2OH
-
14%
b) CH3- O- CH3
-
14%
c) CH3CH2CHO
-
71%
d) CH2= CHOH
Q.3.
Which of the following not only decolourises alkaline potassium permaganate but also gives red precipitate with ammoniacal cuprous chloride solution? [ EAMCET 2006]
-
29%
a) ethane
-
14%
b) methane
-
14%
c) ethene
-
43%
d) acetylene
Explanation
Q.4.
An unkowncompound A has a molecular formula C4H6, when A is treatedwith an excess of Br2, a new substance B with formula C4H6Br4 is formed. A forms a white precipitate with ammonical silvr nitrate solution. A may be ..[ MPPMT1998]
-
29%
a) Butyne-1
-
29%
b) Butyne-2
-
14%
c) Butene -1
-
29%
d) Butene-2
Q.5.
on Q307) Hydrogenation of the adjoining compound in the presence of poisoned palladium catalyst gives ...[ IIT 2001]
-
50%
a) an optically active compound
-
50%
b) an optically inactive compound
-
0%
c) a racemic mixture
-
0%
d) a diastereomeric mixture
Explanation
Q.6.
The class of reactions given by benzeneis
-
0%
a) electrophiulic
-
17%
b) nucleophilic substitution
-
67%
c) electrophilic substitution
-
17%
d) nucleophilic addition
Q.7.
The compound X general formula C5H8 reacts with ammonical AgNO3 to give white precipitate and on oxidation with hot alkalin KMnO4 gives the acid, (CH3)2CHCOOH. Therefore, X is ... [ AIIMS 1994]
-
17%
a) CH2= CHCH = CHCH3
-
33%
b) CH3(CH2)2C ≡ CH
-
50%
c) (CH3)2CH - C≡ CH
-
0%
d) (CH3)2C =C = CH2
Explanation
Q.8.
The highest boiling point is expected for ...[ IIT 1986]
-
0%
a) iso-butane
-
50%
b) n-octane
-
33%
c) 2,2,3,3-tetramethyl butane
-
17%
d) n-methyl pentane
Q.9.
The number of geometrical isomers in CH3 - CH = CH - CH2 - CH = CH2 is .... [ DPMT 2007]
-
50%
a) two
-
33%
b) three
-
0%
c) four
-
17%
d) five
Q.10.
Which of the following deactivates benzene towards further substitution reaction? [ Haryana CEET 1998]
-
14%
a) -OR
-
14%
b) -OH
-
14%
c) -NHR
-
57%
d) -COOR
Q.11.
The angle strain in cyclobutane is ...[ Karnataka CET 2008]
-
33%
a) 19° 22'
-
17%
b) 9° 44'
-
50%
c) 24° 44'
-
0%
d) 29° 16'
Q.12.
Which of the following will convert CH≡CH - CH2-CH2CH3 to CH3COCH2CH3? ..[ BHU 2003]
-
0%
a) H2O/H+
-
43%
b) H2SO4(conc.)/H3PO4
-
43%
c) Hg2+/H2SO4
-
14%
d) K2Cr2O7/KMnO4
Q.13.
A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p- position is ...[ Pb PMT 1998]
-
14%
a) -NH2
-
57%
b) -Cl
-
14%
c) -NO2
-
14%
d) -C2H5
Q.14.
Among the three conformations of ethane, the order of stability follows the sequence [ Kerala 2012]
-
17%
a) eclipsed > gauche > staggered
-
17%
b) eclipsed > staggered > gauche
-
67%
c) staggered > gauche > eclipsed
-
0%
d) gauche > staggered > eclipsed
Q.15.
Statement: Addition of Br2 to 1-butene gives two optical isomers Statement II: The product contains one asymmetric carbon ...[ IIT 1998]
-
43%
a) Statement I is correct Statement II is correct Satement II is a correct explanation of statement I
-
29%
b) Statement I is correct statement II is correct statement II is not the correct explanation of statement I
-
14%
c) Statement I is correct, statement II is incorrect
-
14%
d) Statement I is incorrect statement II is correct
Q.16.
Choose the compound which can react with [Ag(NH3)2]+ and on treatment with alk.KMnO433C-COOH ..[ Rajasthan PMT 2002]
-
17%
a) CH3CH2CH2-C≡C- CH3
-
0%
b) (CH3)2CHCH2 - C ≡CH
-
67%
c) (CH3)3C - C ≡ CH
-
17%
d) (CH3)3C-C≡C - CH3
Q.17.
he number of stereoisomers obtained by bromination of trans-2-buten is ...[ IIT 2007]
-
50%
a) 1
-
17%
b) 2
-
17%
c) 3
-
17%
d) 4
Q.18.
Benzene reacts with methyl chloride in the presence of anhydrous AlCl3 to form ...[ AIMPT 2009]
-
33%
a) chlorobenzene
-
50%
b) toluene
-
0%
c) xylene
-
17%
d) benzyl chloride
Explanation
Q.19.
The alkene C6H10 producing OHC(CH2)4CHO onozonolysisis
-
0%
a) Cyclohexene
-
33%
b) Hexene-1
-
50%
c) Hexene-3
-
17%
d) 1-methylcyclohexene-1
Q.20.
A hydrocarbon of molecular formula, C6H10 reacts with sodamide and the same on ozonolysis followed by hydrogen peroxide oxidation gives two molecules of carboxylic acids, one being optically active. Then the hydrocarbon may be ...[ Kerala PMT 2007]
-
0%
a) 1-hexyne
-
40%
b) 2-hexyne
-
40%
c) 3-hexyne
-
20%
d) 3-methyl-1-pentyne
Explanation
Q.21.
The order of activity of the various o and p- director is ... [ DEC 2000]
-
20%
a) -O- > -OH > -OCOCH3 > -COCH3
-
60%
b) -OH > -O- > -OCOCH3 > -COCH3
-
0%
c) -OH > -O- > -COCH3 > -OCOCH3
-
20%
d) -O- > -COCH3 > -OCOCH3 > -OH
Q.22.
Anti-Markownikoff's addition is not observed in ... [ CET (J&K) 2012]
-
40%
a) 2-butene
-
20%
b) 1-butene
-
20%
c) propene
-
20%
d) 2-pentene
Q.23.
The addition of Hbr is easiest with ...[ MPPMT 2000]
-
0%
a) CH2 = CHCl
-
20%
b) ClCH = CHCl
-
60%
c) CH3-CH=CH2
-
20%
d) (CH3)2C = CH2
Q.24.
The carbon-carbon bond length in benzene is ...[ Karnataka 2009]
-
0%
a) same as in C2H4
-
40%
b) in between C2H6 and C2H2
-
20%
c) in between C2C6 and C2 H
-
40%
d) in between C2H4 and C2H2
Q.25.
Among the paraffins it is generally found that with an increase in the molecular weight
-
0%
a) The freezing point decreases
-
20%
b) The boiling point decreases
-
60%
c) The boiling point increases
-
20%
d) The vapour density decreases
Q.26.
Which of the following is the most reactive towards ring nitration? [ DEC 1994]
-
20%
a) Benzene
-
20%
b) Mesitylene
-
40%
c) Tolune
-
20%
d) m-Xylene
Q.27.
Which of the following species does not exert a resonance effect? [ Karataka CET 2008]
-
20%
a) C6H5OH
-
20%
b) C6H5Cl
-
0%
c) C6H5NH2
-
60%
d) C6H5N+H3
Q.28.
Benzene reacts with CH3Cl in the presence of anhydrous AlCl3 to form ... [ AIPMT 2009]
-
0%
a) Xylene
-
75%
b) Toluene
-
25%
c) Chlorobenzene
-
0%
d) Benzylchloride
Q.29.
Nitrobenzene can be prepared from benzene by using a mixture of conc. HNO3 and conc. H2SOIn the mixture, nitric acid acts as ..[ AIPMT 2009] a/an -
-
0%
a) catalyst
-
80%
b) reducing agent
-
20%
c) acid
-
0%
d) base
Q.30.
Which of the following reactions is an exampleof nucleophilic substitution reaction ? [ AIPMT 2009]
-
0%
a) RX + Mg →RMgX
-
60%
b) RX + KOH → ROH + KX
-
20%
c) 2RX + 2Na → R – R + 2NaX
-
20%
d) RX + H2 → RH + HX