Sail E0 Webinar

12th Grade > Chemistry

REACTION MECHANISM MCQs

Total Questions : 15 | Page 1 of 2 pages
Question 1. When Ph−OH reacts with C2H5I with anhydrous C2H5OH as the solvent in the presence of ethoxide ions, what is the product of this reaction?
  1.    Ph−Me
  2.    Ph−O−Me
  3.    Ph−O−Et
  4.    Ph−Et
 Discuss Question
Answer: Option C. -> Ph−O−Et
:
C
Watch the video that follows!
Question 2. Consider the following reactions carried out at the same temperature: CH3Br+OH−C2H5OH−−−−−→CH3OH+Br−
CH3Br+OH−(CH3)2SO−−−−−−→CH3OH+Br− 
Which of the following statements is correct about these reactions?
  1.    The first reaction occurs faster than the second  
  2.    The second reaction occurs faster than the first 
  3.    Both the reactions occurs at the same rate
  4.    Addition of NaI has no effect no either of these reactions
 Discuss Question
Answer: Option B. -> The second reaction occurs faster than the first 
:
B
Polar aprotic solvents such as DMSO increase the rate of the SN2 reaction.
Question 3. Which of the following statements is incorrect for low reactivity of chloro benzene
  1.    Due to resonance
  2.    Polarity of C-X bond
  3.    sp2 hybridised state of C atom
  4.    Due to +E effect of Cl
 Discuss Question
Answer: Option D. -> Due to +E effect of Cl
:
D
Cl is involved in resonance as well as inductive effect and not in electrometric effect as it is more electronegative.
Question 4. Rate of Reaction,
Rate Of Reaction,is Fastest When ‘Z’ Is
is fastest when ‘Z’ is
  1.    OC2H5
  2.    NH2
  3.    Cl
  4.    OCOCH3
 Discuss Question
Answer: Option C. -> Cl
:
C
Acid halides react fastest among acid derivates.
Question 5. The major product formed in the following reaction is :
The Major Product Formed In The Following Reaction Is :
 Discuss Question
Answer: Option C. -> Cl
:
C
In protic solvent E2 proceeds over SN2.
Question 6. A solution containing 0.2563 g of naphthalene (molecular mass = 128) in 50 g of carbon tetrachloride yields a boiling point elevation of 0.201∘C while a solution of 0.6216 g of an unknown solute in the same mass of the solvent gives a boiling point elevation of 0.647∘C. Find the molecular mass of unknown solute.
  1.    96.44
  2.    86.44
  3.    90
  4.    88
 Discuss Question
Answer: Option A. -> 96.44
:
A
We know that
Kb=ΔTb×W1×Mw21000×W2
First let’s calculate value of KbforCCl4.
For CCl4;
Kb=0.201×50×1281000×0.2563=5.019kkgmol−1
Now, for calculating mass of unknown solute, we can use the same value of Kb.
Mw2=1000×Kb×W2ΔTb×W1
1000×5.019×0.62160.647×50
=96.44
Question 7. What is the order of reactivity of the following compounds towards nucleophilic substitution? What Is The Order Of Reactivity Of The Following Compounds T...
  1.    IV
  2.    IV
  3.    III
  4.    II
 Discuss Question
Answer: Option B. -> IV
:
B
The reactivity depends on the stability of the carbocation obtained upon ionization. Theorder of stability is .
What Is The Order Of Reactivity Of The Following Compounds T...
Question 8. The Reagent For The Above Conversion Is
The reagent for the above conversion is
  1.    Alcoholic KOH
  2.    Alcoholic KOH followed by  NaNH2
  3.    Aqueous KOH followed by NaNH2
  4.    Zn/ CH3COOH
 Discuss Question
Answer: Option B. -> Alcoholic KOH followed by  NaNH2
:
B
The Reagent For The Above Conversion Is
Question 9. The product in the following reaction is
The Product In The Following Reaction Is
 Discuss Question
Answer: Option B. -> Alcoholic KOH followed by  NaNH2
:
A
The Product In The Following Reaction Is
Question 10.
  1.    I > II > III
  2.    II > I > III
  3.    II > III > I
  4.    III > II > I
 Discuss Question
Answer: Option C. -> II > III > I
:
C
The reactivity decreases in the order
Allylic > Secondary > primary.

Latest Videos
Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)
Direction Sense Test Part 1 Reasoning (Hindi)
Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE
Cube & Cuboid Part 1 Reasoning (Hindi)
Data Interpretation (DI) Basic Concept Reasoning (Hindi)
Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)
Sail E0 free webinar Webinars
Real Numbers Part 7 Class 10 Maths
Real Numbers Part 1 Class 10 Maths
Polynomials Part 1 Class 10 Maths

Latest Test Papers

Pie Chart - Test Paper 1 Data Interpretation Reasoning & DI
Tabulation - Test Paper 2 Data Interpretation Reasoning & DI
Test Paper 1 Direction Sense Test Reasoning & DI
ICA , RDIC,GFM Free Modal Test Paper - Non - Technical Branch Old Syllabus 2022 - SAIL Junior Officer E0
GFM Combined 1 Free Revision Test SAIL JO E-0