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  • Give answer! Reaction by which Benzaldehyde cannot be prepared:

Reaction by which Benzaldehyde cannot be prepared:

  • Option 1)

    + Zn/Hg and conc.HCI

  • Option 2)

    + CrO2CI in CS2 followed by H3O+

  • Option 3)

    + H2 in presence of Pd-BaSO4

  • Option 4)

    + CO + HCI in presence of anhydrous A1CI3

 

Answers (1)

best_answer

As we learnt in

Gattermann koch reaction -

(CO+HCl)   can function as formyl chloride for the introduction of a formyl group  (-CHO)

- wherein

 

 

Etard reaction -

chromyl chloride oxidises methyl group to a chromium complex.

- wherein

 

 

Reductive Ozonolysis of alkenes -

In the presence of Zn dust and H2O gives aldehyde.

- wherein

RCH=CHR+O_{3}\rightarrow 2RCHO+H_{2}O_{2}

 

 

 

 

 


Option 1)

+ Zn/Hg and conc.HCI

Correct

Option 2)

+ CrO2CI in CS2 followed by H3O+

Incorrect

Option 3)

+ H2 in presence of Pd-BaSO4

Incorrect

Option 4)

+ CO + HCI in presence of anhydrous A1CI3

Incorrect

Posted by

prateek

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