The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds

  • Option 1)

    III>II>I

  • Option 2)

    II>I>III

  • Option 3)

    I>III>II

  • Option 4)

    I>II>III

 

Answers (2)

As we discussed in concept

Reaction of Aldehydes and Ketones with Grignard reagent -

–  With formaldehyde gives primary alcohol 

–  With aldehyde gives secondary alcohol

–  With ketone gives tertiary alcohol

- wherein

 

 Charge on carbonyl carbon atom and steric hindrance predict the order of reactivity

I > II > III

 


Option 1)

III>II>I

This option is incorrect.

Option 2)

II>I>III

This option is incorrect.

Option 3)

I>III>II

This option is incorrect.

Option 4)

I>II>III

This option is correct.

N Nancy

Option 4) l>ll>lll is the correct order. REASON:Due to hindrence at c=o

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