Question

Which of the following does not answer iodoform test?

• A. N-Butyl alcohol
• B. Sec-Butyl alcohol
• C. Acetophenone
• D. Acetaldehyde

Answer 1

Answer: (A)

N-Butyl alcohol

Answer 2

: Iodoform test is given by the compounds containing $\mathrm { CH } _ { 3 } \mathrm { CO }$ group or $\mathrm { CH } _ { 3 } \mathrm { CO }$group). Sample is heated with and NaOH, the existence of yellow ppt. indicates the presence of $\mathrm { CH } _ { 3 } \mathrm { CO }$ Group or $\mathrm { CH } _ { 3 } \mathrm { CHOH }$ group.

e.g., $\mathrm { CH } _ { 3 } \mathrm { CHO } + 3 \mathrm { I } _ { 2 } + 4 \mathrm { NaOH } \rightarrow$

$\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OH } \xrightarrow { [ \mathrm { O } ] } \mathrm { CH } _ { 3 } \mathrm { CHO } \xrightarrow [ \mathrm { NaOH } ] { \mathrm { I } _ { 2 } } \mathrm { CHI } _ { 3 }$

$\mathrm { CH } _ { 3 } \mathrm { CHOH }$group