Single Choice

Bottles containing $$PhI$$ and $$Ph{CH}_{2}I$$ lost their original labels. They were labelled as $$(A)$$ and $$(B)$$ for testing. $$(A)$$ and $$(B)$$ were separately taken in test tubes and boiled with $$NaOH$$ solutions. The end solution in each tube was made acidic with dilutie $$H{NO}_{3}$$ and some $$Ag{NO}_{3}$$ solution was added. Substance $$(B)$$ gave a yellow precipitate. Which of the following statements is true for this experiment?

AAddition of $$H{NO}_{3}$$ was unnecessary
B$$(A)$$ was $$PhI$$
Correct Answer
C$$(A)$$ was $$Ph{CH}_{2}I$$
D$$(B)$$ was $$PhI$$

Solution

$$PhI+aq. NaOH\rightarrow No\ reaction$$
$$PhCH_2I+Aq. NaOH\rightarrow PhCH_2OH+I^{\ominus}\xrightarrow {AgNO_3}AgI(Yellow\ ppt.)$$
(A) was iodobenzene $$PhI$$ and (B) was benzyl iodide $$PhCH_2I$$.
Since (A) is aromatic iodide, it will not give free iodide ions. Hence, no precipitate will be obtained with silver nitrate.
(B) is alkyl iodide. It will give free iodide ions. Hence, yellow precipitate will be obtained with silver nitrate.

SIMILAR QUESTIONS

Haloalkanes and Haloarenes

In comparison to $$C-Cl$$ bond in ethyl chloride, the $$C-Cl$$ bond in vinyl chloride is:

Haloalkanes and Haloarenes

Which of the following cannot undergo nucleophilic substitution under ordinary conditions?

Haloalkanes and Haloarenes

Which of the following side chain reaction/s can be used to reduce the activity groups such as $$(OH)$$ or $$(-{NH}_{2})$$?

Haloalkanes and Haloarenes

Aryl halides are less reactive towards nucleophilic substitution reaction as compared to alkyl halides due to:

Haloalkanes and Haloarenes

Aryl halides are less reactive towards nucleophilic substitution reaction as compared to alkyl halides due to:

Haloalkanes and Haloarenes

Which of the following would be hydrolysed most readily?

Haloalkanes and Haloarenes

Vinyl chloride on reaction with dimethyl copper gives ____.

Haloalkanes and Haloarenes

Which of the following statements about benzyl chloride is incorrect?

Haloalkanes and Haloarenes

Which of the following statements is incorrect regarding benzyl chloride ?

Haloalkanes and Haloarenes

Which of the following statements about benzyl chloride is incorrect?

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