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Q.

Which of the following compound give yellow precipitate with I₂ and NaOH?

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a

${CH}_{3} {CH}_{2} OH$

b

${CCl}_{3} CHO$

c

${CH}_{3} {CH}_{2} {CH}_{2} OH$

d

$C_{3} H_{7} CHO$

answer is A.

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Detailed Solution

Ethyl alcohol gives positive iodoform test (i.e. yellow ppt. with I₂ and NaOH)

${CH}_{3} {CH}_{2} OH + 4 I_{2} + 6 NaOH \to \underset{yellow ppt.}{{CHI}_{3}} + 5 NaI + {CH}_{3} COONa + 3 H_{2} O$

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Which of the following compound give yellow precipitate with I2 and NaOH?