You are provided with the following four reagents LiAlH4, I2/NaOH, NaHSO3 and schiff's reagent. Which two reagents can be used to distinguish between the compounds in each of tge following pairs. a) CH3CHO and Ch3COCH3 b) Ch3CHO and C6H5CHO c) C6H5COCH3 and C6H5CHO

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Solution

Dear Student

The four reagents are:
LiAlH₄ , I₂NaOH, NaHSO₃ and Schiff's Reagent

The provided compounds are:

a) CH₃CHO and CH₃COCH3
Acetaldehyde and Acetone

Acetaldehyde gives positive Tollen's Test or Schiff's Reagent but Acetone does not.

Acetone gives Iodoform Test (I₂NaOH)

b) CH₃CHO and C₆H₅CHO
Acetaldehyde and Benzaldehyde

Aldehyde does not react with NaHSO₃_.LiAlH₄ is used to reduce alcohol.

Therefore, Schiff's Reagent can be used to distinguish between both of them.
Acetaldehyde can give Iodoform Test but Benzaldehyde do not. However, acetaldehyde is the only aldehyde which gives a positive Iodoform test.

c) C₆H₅COCH₃ and C₆H₅CHO
Acetophenone and Benzaldehyde

One is Ketone and another one is aldehyde, therefore, acetophenone being a methyl ketone can give Iodoform Test but Benzaldehyde cannot.

Benzaldehyde can react with Schiff's reagent but Acetophenone cannot.

Regards

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