MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Chemistry MCQ
Reaction Mechanism Mcq Neet Chemistry
Quiz 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Which of the follwoing contains only three pairs of electrons?
0%
a) Carbocation
0%
b) Carbanion
0%
c) Free radical
0%
d) None of these
Explanation
Answer:(a)
Q.2
Electrophiles are
0%
a) electron loving species
0%
b) electrom hating species
0%
c) nucleus loving reagents
0%
d) nucleus hating reagent
Explanation
Answer:(a)
Q.3
Nucleophiles are
0%
a) electron loving
0%
b) electron hating
0%
c) nucleus loving
0%
d) nucleus hating
Explanation
Answer:(c)
Q.4
Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)
0%
a) – NH2 > – OR > – F
0%
b) – NR2 < – OR < – F
0%
c) – NH2 < – OR < – F
0%
d) – NR2 > – OR > – F
Explanation
Answer:(c)
Q.5
The correct statement regarding electrophile is ... [ NEET 2017]
0%
a) Electrophile is negatively charge species and can form a bnd by accepting a pair oof electrons from a nucleophile
0%
b) Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
0%
c) Electrophile are generally neutral species and can form a bond by accepting a pair of electrons from a uncleophile
0%
d) Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile
Explanation
Answer:(d)
Q.6
The pair of electron in the given carbanion CH3C ≡C-, is present in which orbitals? [ NEET 2016, Pahe I]
0%
a) sp3
0%
b) sp2
0%
c) sp
0%
d) 2p
Explanation
Answer:(c)
Q.7
Consider the following compounds Hyperconjugation occurs in
0%
a) I only
0%
b) II only
0%
c) III only
0%
d) I anad III
Explanation
Answer:(c)
Q.8
Which of the following is the most correct electron displacement for a nucleophilic reaction to take place? [ AIPMT 2015]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(d)
Q.9
Which one is most reactive towards nucleophilic addition reaction? [ AIPMT 2014]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(d)
Q.10
Which one of the following is most reactive towards electrophilic reagent? [ AIPMT 2011]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(a)
Q.11
The stability of carbanions in the following is in the order of ... [ AIPMT 2008]
0%
a) (i) > (ii) > (iii) > (iv)
0%
b) (iii) > (iii) > (iiv) > (i)
0%
c) (iv) > (ii) > (iii) > (i)
0%
d) (i) > (ii) > (iii)
Explanation
Answer:(d)
Q.12
Base strength of is in the order of ... .. [ AIPMT 2008]
0%
a) (ii) > (i) > (iii)
0%
b) (iii) > (ii) > (i)
0%
c) (i) > (iii) > (ii)
0%
d) (i) > (ii) > (iii)
Explanation
Answer:(d)
Q.13
Which one of the following is most reactive towards electrophilic attack? [ AIPMT 2008]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.14
Which of the following is least reactive in a nucleophilic substitution reaction? [ AIPMT 2004]
0%
a) (CH3)3C - Cl
0%
b) CH2 = CHCl
0%
c) CH3CH2Cl
0%
d) CH2 = CHCH2Cl
Explanation
Answer:(b)
Q.15
In HS-, I-, RNH2, NH2 order of proton accepting tendency will be ...[ AIPMT 2001]
0%
a) I- > NH3 > RNH2 > HS-
0%
b) NH3 > RNH3 HS- > I-
0%
c) RNH2 > NH3 > HS- > I -
0%
d) HS> > RNH2 > NH3 > I-
Explanation
Answer:(c)
Q.16
Among the following compounds the decreasing order of reactivity towards electrophilic substitution is ... ..[ AIMPT 200]
0%
a) II > I > III > IV
0%
b) III > I > II > IV
0%
c) IV > I > II > III
0%
d) I > II > III > IV
Explanation
Answer:(b)
Q.17
Correct the increasing order of acidity is as ..[ AIPMT 1994]
0%
a) H2O, C2H2, H2CO3, phenol
0%
b) C2H2, H2O, H2CO3, phenol
0%
c) Phenol, C2H2, H2CO3, H2O
0%
d) C2H2, H2O, Phenol and H2CO3
Explanation
Answer:(d)
Q.18
1° carbocation is more stable than 2° carbocation Reason: Stability ofcarbocation is due to hypercongugation effect.
0%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
0%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
0%
c) Assertion is true, but Reason is false
0%
d) Assertion and Reason are false
Explanation
Answer:(c)
Q.19
Which of the following folecules is least resonance stabilised? [ IIT 2017 main]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(d)
Q.20
The order of stability of the following carbocations [ IIT mains 2013]
0%
a) III > II > I
0%
b) II > III > I
0%
c) I > II > III
0%
d) III > I > II
Explanation
Answer:(d)
Q.21
The correct stability order of the following resonance structure is ... [ IIT 2009]
0%
a) (I) > (II) > (IV) > (III)
0%
b) (I) > (III) > (II) > (IV)
0%
c) (II) > (I) > (III) > (IV)
0%
d) (III) > (I) > (IV) > (II)
Explanation
Answer:(b)
Q.22
Hyperconjugation involves overlap of the following orbitals [ IIT 2008]
0%
a) σ - σ
0%
b) σ - p
0%
c) p - p
0%
d) π - π
Explanation
Answer:(b)
Q.23
ssertion: Tertiary carbonium ions are generally formed more easily than primary carbonium ions. Reason: Hyperconjugative as well as inductive effect due to additional alkyl group stabilize tertiary carbonium ions
0%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
0%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
0%
c) Assertion is true, but Reason is false
0%
d) Assertion and Reason are false
Explanation
Answer:(a)
Q.24
The correct stability order for the following species is ... [ IIT 2008]
0%
a) (II) > (IV) > (I) > (III)
0%
b) (I) > (II) > (III) > (IV)
0%
c) (II) > (I) > (IV) > (III)
0%
d) (I) > (III) > (II) > (IV)
Explanation
Answer:(d)
Q.25
Assertion: Polarisation of one σ-bond caused by the polarization of adjacent σ-bond is referred to as the inductive effect. Reason: The substituents can be classified as electron withdrawing or electron donating groups relative to hydrogen.
0%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
0%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
0%
c) Assertion is true, but Reason is false
0%
d) Assertion and Reason are false
Explanation
Answer:(b)
Q.26
For 1-methoxy-1, 3-butadiene, which of the following resonating structure is least stable? ... [ IIT 2005]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(a)
Q.27
Arrange in order of increasing acidic strength ... ...[ IIT 2004]
0%
a) X > Z > Y
0%
b) Z < x > Y
0%
c) X > Y > Z
0%
d) Z > X > Y
Explanation
Answer:(a)
Q.28
Among the following, the molecule with the highest dipole moment is ... .. [ IIT 2003]
0%
a) CH3Cl
0%
b) CH2Cl2
0%
c) CHCl3
0%
d) CCl4
Explanation
Answer:(a)
Q.29
Polarisation of electons in acrolein may be written as [ IIT 1988]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(d)
Q.30
Inductive effect refers to ....
0%
a) electron displacement along a carbon chain
0%
b) complete transfer of one of the shared pair of electrons to one of the atoms joined by a double bond
0%
c) complete transfer of electrons hitherto unshared
0%
d) none of the above
Explanation
Answer:(a)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page