Question

Which of the following DOES NOT reduce –COOH group: a) NaBH4 b) B2H6 c)LiAlH4 d) NaHSO3​

Answer 1

Answer:

(C) LIAIH4 IRUR8IRIRITIOF

Answer 2

NaBH4 does not reduce  –COOH group

    Explanation:

• Lithium aluminum hydride is a stronger reducing agent than sodium Borohydride which can reduce almost all the carbonyl compound.

• NaBH4 can reduce aldehyde and ketone but not carboxylic acid.

• NaBH4 reduce aldehyde to primary alcohol and reduce ketone to secondary alcohol

• For reduction of carboxylic acid ,lithium aluminum hydride is used as it is effective in reducing even stable compound that are resistant to reduce.

• Lithium aluminum hydride help to reduce the carboxylic acid to primary alcohol.

• Lithium aluminum hydride is more powerful, less specific and more reactive with water.