First reaction is SN1 in which rate does not depend on conc. of nucleophile.
Second reaction is E2 reaction in which rate depends on conc. of base.
Consider the reaction sequence given below : JEE Main 2020 Chemistry, Haloalkanes and Haloarenes — question figure Which of the following statements…
JEE Main 2020 — Chemistry Organic Chemistry
2020mcqhard
Consider the reaction sequence given below :
Which of the following statements is true:
Official previous-year question
Held on 2 Sept 2020 · Verified 6 Jul 2026.
Options
- A
Changing the base from OH⊖ to OR⊖ will have no effect on reaction (2)
- B
Changing the concentration of base will have no effect on reaction (1)
- C
Doubling the concentration of base will double the rate of both the reactions
- D
Changing the concentration of base will have no effect on reaction (2)
Did you get this right?
Sign in to track your attempts and accuracy.
Your note
Sign in to keep a private note on this question. Nothing you write is ever public.
JEE Main Organic Chemistry in other years
More JEE Main Organic Chemistry questions
The correct order of the rate of reaction of the following reactants with nucleophile by SN1 mechanism is: (Given : Structure I and II are rigid) 
2026medium
Identify the incorrect statements.  Choose the correct answer from the options given below:
2026hard
For the following Friedel Craft's alkylation reaction, which of the statements are correct?  A. Major product is n-propyl benzene. B. iso-propyl carbocation intermediate is also generated. C. Multiple substitution is inevitable. D. Introducing electron-donating substituent on benzene will not produce any alkyl benzene. Choose the correct answer from the options given below:
2026medium
Match the LIST-I with LIST-II <table class="pyq-table"><tbody><tr><th>List-I (Reaction)</th><th>List-II (Mechanism)</th></tr><tr><td>A. Williamson Synthesis</td><td>I. Electrophilic addition</td></tr><tr><td>B. Friedel Craft Reaction</td><td>II. Free radical substitution</td></tr><tr><td>C. Bromination of vinyl benzene</td><td>III. Nucleophilic substitution</td></tr><tr><td>D. Chlorination of toluene in light</td><td>IV. Electrophilic substitution</td></tr></tbody></table> Choose the correct answer from the options given below:
2026medium
Consider the following reactions sequence  When the product (P) is subjected to Carius analysis using $AgNO_3$, $1.0$ g of the product (P) will produce _______ g of the precipitate of AgBr. (Nearest Integer) (Given: molar mass in g mol$^{-1}$ C : 12, H : 1, O : 16, N : 14, Br : 80, Ag : 108)
2026hard
Other Chemistry topics for JEE Main
Keep practicing Organic Chemistry
Work through every JEE Main Organic Chemistry PYQ, year by year.