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8.2 Carboxylic acids and their derivative — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry8.2 Carboxylic acids and their derivative1 Mark
MCQ
In the given reaction :

$CH_3-CH_2-COOH$ $\mathop {\xrightarrow{{(i)\,AgN{O_3}}}}\limits_{(ii)\,B{r_2}/\Delta } $ $[X]$

$[X]$ will be :

  • ✓
    Ethyl bromide
  • B
    Propyl bromide
  • C
    Propyl propanoate
  • D
    All of these
✓

Answer

Correct option: A.
Ethyl bromide
a
The treatment of propionic acid with silver nitrate forms silver salt of propioinc acid.

The treatment with bromine results in replacement of alpha hydrogen atom with bromine.

Heating results in decarboxylation.

Hence, the end product is ethyl bromide (compound $X$).

$CH _3- CH _2- COOH \underset{( ii ) Br _2 / \Delta i / ANO }{\longrightarrow} CH _3-\underset{[ X ]}{ CH _2}- Br$

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