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Due to -I effect of Fluorine in A, it is easy to release proton () but in compound B due to +I effect of methyl group it becomes difficlt te release protons. Therefore, compound A is more acidic than compound B.
Since we know that inductive effect depends on distance. Greater is the distance lesser is the effect. So, -I effect in is more. is more acidic than .
is a stronger acid. Fluorine has more -I effect than chlorine. So,  can release proton easily than .
is stronger than   due to -I effect of Fluorine decreases the electron density at OH bond, which makes it easier to lose proton (). The conjugate base of  is more stable than .
On strong oxidation with potassium permanganate () in the presence of strong alkali (KOH) followed by acidic hydrolysis gives benzoic acid.  
Make bromobenzene first Grignard reagent, react it with dry ice (carbon dioxide) followed by acidic hydrolysis gives benzoic acid.  
On strong oxidation with potassium permanganate in presenc of KOH followed by acidic hydrolysis, give benzoic acid 
Strong oxidising agents like potassium permanganate in the presence of KOH, followed by acidic hydrolysis give benzoic acid.
The IUPAC name of the compound is-            2-methyl cyclopentane carboxylic acid
The product of the above reaction is - water is also obtained in this reaction as a by-product    
The product of the above reaction is - Water molecule is eleminated as a by-product in this reaction  
The product of the reaction is a hydrazone, which is formed when ketone and 2, 4-dinitrophenyl hydrazine derivative reacts with each other.  
The product of the reaction is- Water molecule is removed as a by-product in this reaction.  
If +I effect is more its reactivity towards nucleophilic addition is less. and -I is more, more reactive toward addition. So, according to this concept, increasing order of their reactivity in nucleophilic addition reactions- Acetophenone < p-tolualdehyde < benzaldehyde <p-nitrobenzaldehyde    
By the above structure, we can see that, due to +I effect of alkyl group te electron density at Carbonyl carbon increase from ethanal to bytanone. And so the tendency of attacking nucleophile is decreased. Thus the increasig order (reactivity towards nucleophile)- Butanone < propanone < propanal < ethanal  
Increasing order in their boiling points- Alcohol has the highest boiling point due to more extensive intermolecular H-bonding. Aldehyde is more polar than ether so, ethanal has high BP than ethyl ether. And alkane has the lowest BP.
Chromyl chloride oxidise the methyl group into a chromium complex, which on hydrolysis give aldehyde group.  
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