Qstnid -I-8-i-ch<sub>3</sub>co<sub>2</sub>h Or Ch<sub>2</sub>fco<sub>2</sub>h () Ch<sub>2</sub>fco<sub>2</sub>h Or Ch<sub>2</sub>clco<sub>2</sub>h () Ch<sub>2</sub>fch<sub>2</sub>ch<sub>2</sub>co<sub>2</sub>h Or Ch<sub>3</sub>chfch<sub>2</sub>co<sub>2</sub>h () <Img Src="\etl\image\esa-cbse-xii\chem-hwh-sb2\c03/31l_m7d7a6d1a.jpg" Width="311" Height="43" Border="0"> - 03: Aldehydes Ketones And Carboxylic Acids - Neet-xii-chemistry

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NEET-XII-Chemistry

03: Aldehydes Ketones and Carboxylic Acids

page 3

Qstn# I-8-i Prvs-Qstn Next-Qstn

#8-i
CH₃CO₂H or CH₂FCO₂H
() CH₂FCO₂H or CH₂ClCO₂H
() CH₂FCH₂CH₂CO₂H or CH₃CHFCH₂CO₂H
()

Ans :

The +I effect of -CH₃ group increases the electron density on the O-H bond. Therefore, release of proton becomes difficult. On the other hand, the -I effect of F decreases the electron density on the O-H bond. Therefore, proton can be released easily. Hence, CH₂FCO₂H is a stronger acid than CH₃CO₂H.
()

F has stronger -I effect than Cl. Therefore, CH₂FCO₂H can release proton more easily than CH₂ClCO₂H. Hence, CH₂FCO₂H is stronger acid than CH₂ClCO₂H.
()

Inductive effect decreases with increase in distance. Hence, the +I effect of F in CH₃CHFCH₂CO₂H is more than it is in CH₂FCH₂CH₂CO₂H. Hence, CH₃CHFCH₂CO₂H is stronger acid than CH₂FCH₂CH₂CO₂H.
()

Due to the -I effect of F, it is easier to release proton in the case of compound (A). However, in the case of compound (B), release of proton is difficult due to the +I effect of -CH₃ group. Hence, (A) is a stronger acid than (B).

#8-ii
CH₂FCO₂H or CH₂ClCO₂H
Ans :

F has stronger -I effect than Cl. Therefore, CH₂FCO₂H can release proton more easily than CH₂ClCO₂H. Hence, CH₂FCO₂H is stronger acid than CH₂ClCO₂H.

#8-iii
CH₂FCH₂CH₂CO₂H or CH₃CHFCH₂CO₂H
Ans :

Inductive effect decreases with increase in distance. Hence, the +I effect of F in CH₃CHFCH₂CO₂H is more than it is in CH₂FCH₂CH₂CO₂H. Hence, CH₃CHFCH₂CO₂H is stronger acid than CH₂FCH₂CH₂CO₂H.

#8-iv

Ans :

Due to the -I effect of F, it is easier to release proton in the case of compound (A). However, in the case of compound (B), release of proton is difficult due to the +I effect of -CH₃ group. Hence, (A) is a stronger acid than (B).