MCQs for CSIR UGC NET & GATE
Reaction Intermediates
Chapterwise Assignment-1
Q1. The reaction given below is an example of
(a) E2 elimination
(b) E1 elimination
(c) syn elimination
(d) E1CB elimination
Q2. The relative rates of solvolysis of iodides A-C are
(a) C>A>B
(b) C>B>A
(c) B>C>A
(d) B>A>C
Q3. Consider the following reaction
In an experiment, 1.99g pf bromide A on reaction with ethanolic potassium hydroxide gave 1.062 g of a mixture of the olefins B and C. If the ratio of olefins B:C formed is 2:1, the yields for their formation, respectively are
(a) 60% and 30%
(b) 25% and 50%
(c) 66% and 33%
(d) 54% and 27%
Q4. The major product in the following reaction is
Q5. The major products A and B formed in the following reaction sequence are:
Q6. The major product formed in the following reaction is
Q7. Deuterium kinetic isotope effect for the following reaction was found to be 4.0. Based on this information, mechanism of the reaction is
(a) E1
(b) E2
(c) E1CB
(d) free radical
Q8. The major product formed in the reaction of trans-1-bromo-3-methyl cyclobutene with sodium iodide in DMF is
Q9. The major product in the following reaction is
Q10. The major product formed in the below reaction is
Ans Key
Q1d Q2a Q3a Q4d Q5d Q6a Q7b Q8c Q9b Q10a
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About carbocations
Carbocations are intermediates in many important reactions, making them a crucial topic for students preparing for exams such as CSIR UGC NET and GATE. Practice with carbocation MCQ questions can help students test their understanding of this concept and improve their performance on these exams. It is important for students to be familiar with the stability, formation, and reactions of carbocations in order to succeed on these exams. By studying and practicing with carbocation MCQ questions, students can gain confidence and improve their chances of success on these important exams.