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NEET Chemistry MCQ
Hydrocarbons Mcq Neet Chemistry
Quiz 12
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Q.1
Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by [ AIPMT 2010]
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a) Oxidation
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b) Cracking
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c) Distillation under reduced pressure
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d) Hydrolysis
Explanation
Answer:(b)
Q.2
Given are cyclohexanol (I), acetic acid (II) 2,4,6- trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be .. [ AIPMT 2010]
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a) III > II > IV > I
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b) II > III > I > IV
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c) II > III > IV > I
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d) III > IV > II > I
Explanation
Proton doner is an acid and acceptor is base Answer:(a)
Q.3
on Q336) In a set of reactions, ethyl benzene yielded a product D. [ AIPMT 2010]
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a)
0%
b)
0%
c)
0%
d)
Explanation
-CH2CH3will oxidised to CH2COOH on reacting with Br2, Br will go to meta position of benzenering as -cooh is meta directing When reacted with C2H5OH it will form ester optION D Answer:(d)
Q.4
Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is : [ AIPMT 2010]
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a) CH3COOCH3
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b) CH3CONH2
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c) CH3COOCOCH3
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d) CH3COCl
Explanation
Answer:(d)
Q.5
Which one is most reactive towards electrophilic reagent? [ AIPMT 2011]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(a)
Q.6
In the following the most stable conformation of n-butane is:[ AIPMT 2011]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.7
Which one of the following is most reactive towards electrophilic reagent ?[ AIPMT 2011]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(c)
Q.8
Which one is a nucleophilic substitution reaction among the following ? [ AIPMT 2011]
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a) CH3CHO + HCN → CH3CH(OH)CN
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b)
0%
c)
0%
d)
Explanation
Answer:(d)
Q.9
on Major product is
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(c)
Q.10
Among the following compounds the one that is most reactive towards electrophilic nitration is ..[ AIPMT 2012]
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a) Toluene
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b) Benzene
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c) Benzoic acid
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d) Nitrobenzene
Explanation
Due to +R effect of methyl group, toluene is more reactive towards electrophilic nitration Answer:(a)
Q.11
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating? [ NEET 2013]
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a) —C ≡ N
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b) —SO3H
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c) —COOH
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d) —NO2
Explanation
Answer:(d)
Q.12
on Q346) The order of stability of the following tautomeric compounds is ..[ NEET 2013]
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a) I > II > III
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b) III > II > I
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c) II > I > III
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d) II > III > I
Explanation
Answer:(b)
Q.13
on Q347) Identify Z in the sequence of reaction :
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a) CH3(CH2)4–O–CH3
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b) CH3CH2–CH(CH3)–O–CH2CH3
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c) CH3–(CH2)3–O–CH2CH3
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d) (CH3)2CH2–O–CH2CH3
Explanation
Answer:(c)
Q.14
Which one is most reactive towards Nucleophilic addition reaction?
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.15
on Q349) What products are formed whenthe following compound is treated with Br2 in the presence of FeBr3?
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a)
0%
b)
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c)
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d)
Explanation
Answer:(a)
Q.16
on Q350) What is the name of following reaction
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a) Gatterman – Koch reaction
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b) Williamson Synthesis
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c) Williamson continuous etherification process
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d) Etard reaction
Explanation
Answer:(b)
Q.17
Which of the following is the most correct electron displacement for a nucleophilic reaction to take place ?
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a)
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b)
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c)
0%
d)
Explanation
Answer:(d)
Q.18
on Q352) A single compound of the structure [ NEET 2015]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.19
In which of the following compounds, the C - Cl bond ionisation shall give most stable carbonium ion ?[ NEET 2015]
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a)
0%
b)
0%
c)
0%
d)
Explanation
3° carbocation are more stable than benzylic carbocation Answer:(c)
Q.20
The reaction of C6H5CH = CHCH3 with HBr produces .. [ NEET 2014]
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a)
0%
b)
0%
c)
0%
d) C6H5CH2CH2CH2Br
Explanation
Answer:(b)
Q.21
2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid ?[ NEET 2015]
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a) (CH3)2C=CH-CH2CH3
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b) (CH3)2CH-CH2-CH=CH2
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c) (CH3)3C-CH=CH2
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d)
Explanation
Answer:(c)
Q.22
In the reaction with HCl, an alkene reacts in accordance with the Markovnikov's rule, to give a product 1-chloro-1-methylcyclohexane. The possible alkene is :-[ NEET 2015]
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a)
0%
b)
0%
c) a and b
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d)
Explanation
Answer:(c)
Q.23
Which of the following statements is not correct for a nucleophile ?[ NEET 2016]
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a) Nucleophiles attack low e- density sites
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b) Nucleophiles are not electron seeking
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c) Nucleophile is a Lewis acid
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d) Ammonia is a nucleophile
Explanation
Nucleophiles are electron rich species so act as Lewis base Answer:(c)
Q.24
hich of the following compounds shall not produced propene by reaction with HBr followed by elimination of direct only elimination reaction ?[ NEET 2016]
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a) H2C=C=O
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b)
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c)
0%
d)
Explanation
Answer:(a)
Q.25
Which one is the correct order of acidity? [NEET 2017]
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a) CH2=CH2 > CH3-CH=CH2 > CH3-C ≡CH > CH ≡ CH
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b) CH ≡ CH > CH3-C ≡CH > CH2=CH2 > CH3-CH3
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c) CH ≡CH > CH2=CH2 > CH2 =CH2 > CH3 - CH3
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d) CH3-CH3 > CH2 = CH2 > CH3 - C ≡CH > CH ≡ CH
Explanation
CH ≡ CH : 2 acedic hydrogen CH3-C ≡CH: 1 acedic hydrogen Answer:(b)
0 h : 0 m : 1 s
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