Tiêu đề 11. ALCOHOLS, PHENOLS and ETHERS.pdf ✅

SELECT LIST OF QID’s We Generate Paper for You PROFESSIONAL QUESTION PAPER GENERATION SERVICE FOR NEET & JEE 11. ALCOHOLS, PHENOLS and ETHERS #QID# 11995 (1.) The compound that is most difficult to protonate is (a.) (b.) (c.) (d.) [NEET 2019] Ans: a Exp: (a): In Ph O H •• •• − − , the lone pair of oxygen is in conjugation with phenyl group so, it is least basic among the given compounds and is most difficult to protonate. #QID# 11996 (2.) The structure of intermediate A in the following reaction is (a.) (b.) (c.)
SELECT LIST OF QID’s We Generate Paper for You PROFESSIONAL QUESTION PAPER GENERATION SERVICE FOR NEET & JEE (d.) Ans: c Exp: (c) : #QID# 11997 (3.) When vapours of a secondary alcohol is passed over heated copper at 573 K , the product formed is (a.) a carboxylic acid (b.) an aldehyde (c.) a ketone (d.) an alkene[Odisha NEET 2019] Ans: c Exp: (c): #QID# 11998 (4.) The major products C and D formed in the following reactions respectively are excessHI H C CH CH O C(CH ) C D 3 2 2 3 3 − − − − ⎯⎯⎯⎯→ + (a.) H C CH CH I 3 2 2 −−− and 3 3 I C(CH ) − (b.) H C CH CH OH 3 2 2 −−− and 3 3 I C(CH ) − (c.) H C CH CH I 3 2 2 −−− and HO C(CH ) − 3 3 (d.) H C CH CH OH 3 2 2 −−− and HO C(CH ) − 3 3 [Odisha NEET 2019] Ans: a Exp: (a): Ethers are readily attacked by Hl to give an alkyl halide and alcohol. But when heated with excess of Hl, the product alcohol first formed reacts further with HI to form the corresponding alkyl iodide. ( ) Heat 2 excess R O R 2HI RI R I H O − − + ⎯⎯   ⎯→ + + #QID# 11999
SELECT LIST OF QID’s We Generate Paper for You PROFESSIONAL QUESTION PAPER GENERATION SERVICE FOR NEET & JEE (5.) In the reaction, the electrophile involved is (a.) dichloromethyl cation C HCl 2 +       (b.) formyl cation C HO +       (c.) dichloromethyl anion (CHCl2 ) (d.) dichlorocarbene (: CCl2 ) [NEET 2018] Ans: d Exp: (d): It is Reimer‐Tiemann reaction. The electrophile formed is dichlorocarbene (: CCl2 ) which is formed according to the following mechanism : CHCl OH 3 + ( ) ( ) Cl Elimination 3 2 2 Dichlorocarbene electrophile CCl H O : CCl − − − •• + ⎯⎯⎯⎯⎯⎯→ #QID# 12000 (6.) Compound A,C H O 8 10 , is found to react with NaOI (produced by reacting Y with NaOH ) and yields a yellow precipitate with characteristic smell. A and Y are respectively (a.) and 2 I (b.) and 2 I (c.) and 2 I (d.) and 2 I [NEET 2018] Ans: c Exp: (c): As the compound is giving yellow precipitate with NaOI that shows it is undergoing haloform reaction. Haloform reaction is shown by the compounds having
SELECT LIST OF QID’s We Generate Paper for You PROFESSIONAL QUESTION PAPER GENERATION SERVICE FOR NEET & JEE or group Hence, the compound A is 2NaOH 2 'Y' + →I NaOI + + NaI H2 #QID# 12001 (7.) Identify the major products P,Q and R in the following sequence of reactions: (a.) R CH CH OH = − 3 2 (b.) (c.) R CH CH OH CH = 3 3 ( ) (d.) R CH CO CH = − − 3 3 [NEET 2018]