Question
With respect to the compounds I - V choose the correct statement(s).
JEE Advanced
Chemistry
General Organic Chemistry
2020
JEE Advanced 2020 (Paper 1)
JEE Advanced Chemistry Question (2020) — Solution
Options
- A. The acidity of compound I is due to delocalization in the conjugate base.
- B. The conjugate base of compound IV is aromatic.
- C. Compound II becomes more acidic, when it has a - NO 2 substituent.
- D. The acidity of compounds follows the order I > IV > V > II > III .
Answer
C. Compound II becomes more acidic, when it has a - NO 2 substituent.
Step-by-step solution
( A ) is stabilised by conjugation ( B ) Conjugation base of is which is an aromatic anion ( C ) - NO 2 group is an electron withdrawing group it increases acidic strength of any compound to which it is added. ( D ) The acidic strength order on the basis of pK a data IV > V > I > II > III is
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