Among the following the one that gives positive iodoform test upon reaction with I_2 and NaOH is

  • Option 1)

    CH_3CH_2CH(OH)CH_2CH_3

  • Option 2)

    C_6H_5CH_2CH_2OH

  • Option 3)

  • Option 4)

    PhCHOHCH_3

 

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

 

 Only those alcohols which contain -CHOHCH_{3} group undergo haloform reaction.


Option 1)

CH_3CH_2CH(OH)CH_2CH_3

This option is incorrect

Option 2)

C_6H_5CH_2CH_2OH

This option is incorrect

Option 3)

This option is incorrect

Option 4)

PhCHOHCH_3

This option is correct

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