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Hydrocarbons Mcq Neet Chemistry
Quiz 3
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Q.1
ion Q61) Identify the product in the reaction ...[ DUMET 2010]
0%
a) PhCH2CH2CHO
0%
b) PhCOCH2CH3
0%
c) PhCH2COCH3
0%
d) PhCOCOMe
Explanation
Answer:(b)
Q.2
n-Propyl bromide on treatmnet with ethanolic potassium hydroxide produces ...[ IIT 1987]
0%
a) Propanol-1
0%
b) Propene
0%
c) Propanoil-2
0%
d) Ethyl propyl ether
Explanation
Alcoholic KOH specially in ethylene alcohol, produce C2H5O-. These ions are stronger than OH- ion. Thus they reacts with β hydrogen of alkyl halid to produce alkene. This is elemination reaction Answer:(b)
Q.3
Elimination of bromine from 2-bromobutane results in the formation of ...[ JCECE 2008]
0%
a) equimolar mixture of 1- and 2-butene
0%
b) predominantly -2- butene
0%
c) predominantly-1-butene
0%
d) predominantly-2-butyne
Explanation
Answer:(b)
Q.4
The treatment of benzene with isobutene in the presence of sulphuric acid gives ...[ AIIMS 2003]
0%
a) Isobutylbenzene
0%
b) tert-Butytlbenzene
0%
c) n-butylbenzene
0%
d) No reaction
Explanation
Answer:(b)
Q.5
The ortho/para directing group among the following is ...[ AIIMS 2003]
0%
a) COCH3
0%
b) NHCOCH3
0%
c) COOH
0%
d) CN
Explanation
- NHCOCH3 is o-p directing group as it directs the incoming group to the o- and p- position by increasing e- density at these positions Answer:(b)
Q.6
X is heated with sodalime and gives ethane, X is ... [ AFMC 2005]
0%
a) ethanoic acid
0%
b) methanoic acid
0%
c) propanoic acid
0%
d) ether (a) or (c)
Explanation
Answer:(c)
Q.7
When acetylene reacts with water in the presence of HgSO4, the compound actually isolated is
0%
a) CH3COCH3
0%
b) CH3-CHO
0%
c) CH2 + CH2
0%
d) CH2= CH(OH)
Explanation
Answer:(b)
Q.8
Propyne anad propene can be distinguished by ...[ IIT 2000 ]
0%
a) conce. H2SO4
0%
b) Br2 in CCl4
0%
c) dil. KMnO4
0%
d) AgNO3 in ammonia
Explanation
Terminal alkynes forms silver salt with Tollen's reagent while alkene does not react with Tollen's reagent Answer:(d)
Q.9
Which of the following compounds reacts with sodium toliberate hydrogen gas? [ Pb CET 1986]
0%
a) Ethane
0%
b) Propylene
0%
c) Acetylene
0%
d) Benzene
Explanation
Only acetylene has acidic hydrogen and hence reacts with Na to evolve H2 gas 2 HC ≡ CH + 2Na → 2HC≡CNa + H2(g) Answer:(c)
Q.10
When propyne is treated is treated with aqueous H2SO4 in presence of HgSO4, the major product is ...[ IIT 1983]
0%
a) Propanal
0%
b) n-Propyl hydrogen sulphate
0%
c) Acetone
0%
d) Propanol
Explanation
Answer:(c)
Q.11
The decreasing order of reactivity towards electrophilic substitution reaction of the following compounds,Benzene;Chlorobenzene;Nitrobenzene;Toluene is ...[ Kerala PMT 2008]
0%
a) 1 > 3 > 4 > 2
0%
b) 4 > 1 > > 3 > 2
0%
c) 4 > 1 > 2 > 3
0%
d) 4 > 2 > 1 > 3
Explanation
The decreasing order of reactivity towards electrophilic substitution is as follows Toluene > Benzene > Chlorobenzene > Nitrobenzeene Answer:(c)
Q.12
Coke is obtained by heating coal in the ... [ Pb CET 1988]
0%
a) Presence of air
0%
b) Restricted supply of air
0%
c) Absence of air
0%
d) Presence of catalyst
Explanation
Answer:(c)
Q.13
In the preparation of alkene from alcohol using Al2O3 which is effective factor? [ AIPMT 2001]
0%
a) Porosity of Al2O3
0%
b) Temperature
0%
c) Concentration
0%
d) Surface area of Al2O3
Explanation
Answer:(d)
Q.14
The conversion of ClCH=CH-Cl to Cl2CH - CHCl2 can be carried out with ... [ DEC 2000]
0%
a) Cl2
0%
b) Cl2/>hν
0%
c) Cl2/AlCl3
0%
d) Cl2/aq.NaOH
Explanation
Answer:(a)
Q.15
Liquid hydrocarbons is converted into a mixture of gaseous hydrocarbon by ...[ AIPMT (Prelims) 2010]
0%
a) cracking
0%
b) hydrolysis
0%
c) oxidation
0%
d) distillation
Explanation
In cracking experiment the vapour of liquid paraffin (a mixture of saturated hydrocarbons) is cracked by passing it over a heated catalyst. The mixture of gaseous short-chain hydrocarbons produced is collected and tested for unsaturation with bromine water. This experiment models the industrial cracking process which is important due to human demand for fuel. Answer:(a)
Q.16
Number of isomers which can be theoretically obtained on monochlorination of 2-methylbutane is ... [ Pb. CET 1989]
0%
a) 1
0%
b) 2
0%
c) 3
0%
d) 4
Explanation
2-methylbutane, have four types of hydrogen atoms hnce gives four isomers Answer:(d)
Q.17
Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne? [ AIPMT 2012]
0%
a) NaNH2
0%
b) HCl
0%
c) O2
0%
d) Br2
Explanation
Terminal alkynes (1-butyne) react with NaNH2 to form sodium acetylide and evolve hydrogen but -2butyne do not Answer:(a)
Q.18
eaction of propene with HOCl proceedsvia addition of ...[ IIT 2001]
0%
a) H+ in the first step
0%
b) Cl+ in the first step
0%
c) OH- in the first stape
0%
d) Cl+ and OH- in a single step
Explanation
On hetrolytic fission of HOCl , HO- and Cl+ is produced as oxygen is moreelectronegative than Cl Answer:(b)
Q.19
A salt producing hydrocarbon among these compound is ... [ KCET 2002]
0%
a) Ethene
0%
b) Ethyne
0%
c) Methane
0%
d) Ethane
Explanation
CaC2 + 2H2O → CH ≡ CH +Ca(OH)3 Al4C3 + 12H2 → 3CH4 +4 Al(OH)3 Al4C3 is a covalent compound not salt Answer:(b)
Q.20
ion Q80) What is M and N in following reaction? [ IIT 2006]
0%
a) 6, 6
0%
b) 6, 4
0%
c) 4, 4
0%
d) 3, 3
Explanation
Total products 6 i.e. M = 6 Fractional distillation cannot separate enantiomers thus N = 4 Answer:(b)
Q.21
Meta-directing and deactivating group in aromatic electrophilic substitution is ...[ Kerala PMT 2012]
0%
a) NO3-
0%
b) NO2
0%
c) NO2-
0%
d) NO2+
Explanation
NO2+ (nitronium ion) is the active species involved in nitration of benzene HNO3 + 2H2SO4 → NO2- + 2HSO4- + H3O Answer:(d)
Q.22
Tetrabromoethane on heating with Zn gives ... ..[BHU 2000 ]
0%
a) Ethyl bromide
0%
b) Ethane
0%
c) Ethene
0%
d) Ethyne
Explanation
Answer:(d)
Q.23
CH3COOH is reacted with HC ≡ CH in presence of Hg2+, the product is
0%
a)
0%
b) CH3CH2(OOC - CH3)
0%
c) CH3CH(OOC - CH3)2
0%
d) none of the above
Explanation
Answer:(c)
Q.24
Which of the following will yield a mixture of 2-chlorobutene and 3-chlorobutene on treatment with HCl
0%
a) CH2=C=CH-CH3
0%
b) H2C= C(CH3)-CH=CH2
0%
c) CH3 = CH - CH = CH2
0%
d) HC + CH - CH = CH2
Explanation
Answer:(a)
Q.25
Main constituent(s) of LPG is/ar ...[ AFMC 2009]
0%
a) methane
0%
b) H2, CH4, iso-butane
0%
c) iso-butane, propane
0%
d) none of these
Explanation
Answer:(c)
Q.26
he highest boiling point is expected for ...[ IIT 1986]
0%
a) Isooctane
0%
b) n-octane
0%
c) 2,2,3,3- tetramethylbutane
0%
d) n-butane
Explanation
n-octane has the longest chain of eight carbon atoms and hence has the highest boiling point Answer:(b)
Q.27
2-hexyne gives trans-2-hexene on treatment with ...[ IIT 2004]
0%
a) Li/NH3
0%
b) Pd/BaSO4
0%
c) LiAlH4
0%
d) Pt/H2
Explanation
Alkynes on treatment with alkali metals in liquid ammonia gives trans hydrogenation product Answer:(a)
Q.28
Which is the most suitable reagent among the following to distinguish compound (3) from the rest of the compound? CH3 - C ≡ C - CH3 CH3 - CH2 - CH2 - CH3 CH3 - CH2 - C ≡ CH CH3 - CH = CH2
0%
a) Bromine in carbon tetrachloride
0%
b) Bromine in acetic acid
0%
c) Alk. KMnO4
0%
d) Ammoniacal silver nitrate
Explanation
Ammoniacal silver nitrate is the only one from given option which react with terminal alkynes remaining three will reactswith all unsaturated compounds Answer:(d)
Q.29
ion Q89) Arrange the following in increasing order of their release of energy on combusion
0%
a) III < IV
0%
b) I < II < IV < III
0%
c) III < IV < II < I
0%
d) I > II > III > IV
Explanation
More the number of C-atoms having maximum hydrogen, i.e. CH3groups,greater is the heat of combusion Answer:(a)
Q.30
The catalyst used in the Wacker process of oxidation of ethene to ethanal is ...[ Kerala PMT 2012]
0%
a) PdCl2
0%
b) V2O5
0%
c) Nickel complexes
0%
d) TiCl4 and Al(CH3)3
Explanation
Alkenes can be converted to aldehydes and ketones by treating it with an acidified aqueous solution of PdCl2 and CuCl2 (cupric chloride) in presence of air or oxygen. This method is known as Wacker's process Answer:(a)
0 h : 0 m : 1 s
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