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This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
1. |
Which of the following is not the examples of E1CB reaction? |
A. | a) |
B. | b) |
C. | c) |
D. | d) |
Answer» E. | |
2. |
Which of the following are incorrect statement? |
A. | X being electronegative, makes the H (on C-2) more acidic |
B. | Due to electron withdrawal nature of X, it stabilises the carbanion |
C. | (X) destabilises the carbanion due to the presence of lone pairs |
D. | The reaction proceeds by an E1CB pathway |
Answer» D. The reaction proceeds by an E1CB pathway | |
3. |
Which of the following compounds cannot give E1CB reaction? |
A. | CF3 – CHCl2 |
B. | C6h5 – CH2 – CH2F |
C. | CH3 – CH2 – CH2Br |
D. | d) |
Answer» E. | |
4. |
In which reaction product formation takes place by hoffmann rule? |
A. | I and II |
B. | II and III |
C. | I, II and III |
D. | I, II, III and IV |
Answer» E. | |
5. |
Which incorrect about alkyl bromide having molecular formula C5H11Br? |
A. | One isomeric alkyl bromide undergoes E1 elimination at the fastest rate |
B. | Only one is incapable of reacting by the E2 mechanism |
C. | Only one isomer gives a single alkene on E2 elimination |
D. | 2-Bromopentane gives the most complex mixture of alkenes on E2 elimination |
Answer» D. 2-Bromopentane gives the most complex mixture of alkenes on E2 elimination | |
6. |
Which of the following statement (s) is/are true about the following eliminations? |
A. | (1) Hoffmann product is major product in I (2) Saytzeff product is major product in I (3) Hoffmann product is major product in II (4) Saytzeffproduct is major product in II |
B. | 1 and 2 |
C. | 1 and 4 |
D. | 2 and 3 |
E. | 3 and 4 |
Answer» C. 1 and 4 | |
7. |
Which of the following statement is correct regarding the following reaction? |
A. | Major product is endocyclic alkene formed according to Saytzeff |
B. | Major product is exocyclic alkene formed according to Saytzeff |
C. | Major product is exocyclic alkene formed according to Hoffmann |
D. | Major product is endocyclic alkene formed according to Hoffmann |
Answer» D. Major product is endocyclic alkene formed according to Hoffmann | |
8. |
When the all-cis isomer of C6H6Cl6 (2, 3, 4, 5, 6-Hexachlorocyclohexane) is heated with alc.KOH, what will be the most probable product? |
A. | a) |
B. | b) |
C. | c) |
D. | d) |
Answer» C. c) | |
9. |
Which of the following is incorrect statement for the giver reaction? |
A. | Rate of formation of II and IV would be identical |
B. | Rate of formation of I would be slower than that of III |
C. | Formation of I would show primary isotope effect |
D. | Formation of III involves E1 reaction |
Answer» E. | |
10. |
Predict the product for the following elimination reaction. |
A. | a) |
B. | b) |
C. | c) |
D. | d) |
Answer» C. c) | |
11. |
Assuming both the reactions as E1, where will the expected ratio between KH/KD lies between? |
A. | nearly I |
B. | nearly 3 |
C. | nearly 5 |
D. | anything in between 2 and 8 |
Answer» B. nearly 3 | |