In the following sequence of reactions,

CH_3CH_2OH\xrightarrow[]{P+I_2}A\xrightarrow[ether]{Mg}B\xrightarrow[]{HCHO}C\xrightarrow[]{H_2O}D

the compound D is

  • Option 1)

    propanal

  • Option 2)

    butanal

  • Option 3)

    n-butyl alcohol

  • Option 4)

    n-propyl alcohol.

 

Answers (1)

As we learnt in 

Test for alcohols by Victor - Meyer's test -

Reagents used 

P+I_{2},\:AgNO_{2}, \:HNO_{2},\:NaOH

- wherein

1^{\circ}alcohol\rightarrow red\:color

2^{\circ}alcohol\rightarrow blue\:color

3^{\circ}alcohol\rightarrow No\:action

 

 

Reaction of Haloalkanes with Mg in presence of ether -

Grignard reagent is obtained    

- wherein

 

CH_3CH_2OH\overset{P+I_2}{\rightarrow}CH_3CH_2I\xrightarrow[dry \:ather]{Mg}CH_3CH_2MgI\overset{HCHO}{\rightarrow}CH_3CH_2CH_2OHO\overset{H_2O}{\rightarrow} CH_3CH_2CH_2OH +MG(OH)I

CH_3CH_2CH_2OH \:n - propylachohol

fig. 8


Option 1)

propanal

This option is Incorrect

Option 2)

butanal

This option is Incorrect

Option 3)

n-butyl alcohol

This option is Incorrect

Option 4)

n-propyl alcohol.

This option is Correct

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