Question

(a) ch3ch2cooh (b) ch3cooh (c) c6h5cooh (d) c6h5ch2cooh which one is the strongest acid

Answer 1

Answer:

ch3ch2cooh

Explanation:

it,s answer is ch3ch2cooh

Answer 2

Answer:

The strongest acid is  (c) $C_{6} H_{5} COOH$

Explanation:

Among the four acids, Benzoic acid is strongest compared to the others.

• In the case of Aliphatic acids - Acid strength increases with an increasing number of electron-withdrawing substituents  such as$F, Cl, NO_{2} ,CN ,etc.$
• While acid strength decreases with an increase in the size of the alkyl group  and the presence of electron-donating substituents such as  $R, OR, OH, etc.$
• In  $CH_{3} COOH$ and $CH_{3} CH_{2} COOH$, the presence of the methyl group intensifies the negative charge on the carboxylate ions (+ I effect). Thus, the carboxylate ion is destabilized. Consequently, the carboxylic acid becomes less acidic.
• Greater the +I effect, lesser is the stability of the carboxylate ion and lesser is the strength of the acid.
• In the case of aromatic acids, the presence of electron releasing groups at the nucleus intensifies the negative charge on the carboxylate ion, which results in the anion getting destabilized. Thus acidic strength falls.
• In  $C_{6} H_{5} CH_{2} COOH$ the presence of methyl group at the aromatic ring destabilizes the carboxylate ring and it has lower acidic strength as compared to Benzoic acid.
• The increasing acidic strength of the given four acids is $CH_{3} CH_{2} COOH < CH_{3} COOH < C_{6} H_{5} CH_{2} COOH < C_{6} H_{5}COOH$