HBr reacts with CH_2=CH-OCH_3  under anhydrous conditions at room temperature to give

  • Option 1)

    CH_3CHO  and CH_3Br

  • Option 2)

    BrCH_2CHO  and CH_3OH

  • Option 3)

    BrCH_2-CH_2-OCH_3

  • Option 4)

    H_3C-CHBr-OCH_3

 

Answers (1)

As we learnt in

Chemical properties of aldehydes and ketones -

Undergo nucleophilic addition reactions at carbon-oxygen double bond, hybridization of carbon changes from sp2 to  sp2.  Aldehydes are more reactive than ketones due to steric hindrance and  +I effect of an alkyl group.

-

 

 

Reactivity order of hydrohalic acid -

Towards electrophilic addition reaction reactivity order is

HI> HBr> HCl> HF

- wherein

H-I Less bond associate enthalpy.

 

 Electrophilic addition reaction is most favourable

Halogen

CH_{2}= CH-OCH_{3}+HBr\rightarrow CH_{3}-CH(Br)-O-CH_{3}

(Methyl vinyl ether)


Option 1)

CH_3CHO  and CH_3Br

This option is Incorrect

Option 2)

BrCH_2CHO  and CH_3OH

This option is Incorrect

Option 3)

BrCH_2-CH_2-OCH_3

This option is Incorrect

Option 4)

H_3C-CHBr-OCH_3

This option is Correct

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