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9. Hydricarbon — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry9. Hydricarbon1 Mark
MCQ
Which is the most suitable reagent among the following to distinguish compound $(3)$ from rest of the compounds ?

$1.\,\,CH_3-C  \equiv  C -CH_3$

$2.\,\,CH_3 - CH_2 - CH_2 - CH_3$

$3. \,\,CH_3 - CH_2C  \equiv CH$

$4.\,\,CH_3 - CH = CH_2$

  • A
    Bromine in carbon tetrachloride
  • B
    Bromine in acetic acid
  • C
    Alk $KMnO_4$
  • ✓
    Ammonical silver nitrate
✓

Answer

Correct option: D.
Ammonical silver nitrate
d
$Br_2$ in $CCl_4$ $(a)$, $Br_2$ in $CH_3COOH$ $(b)$ and alk. $KMnO_4$ $(c)$ will react with all unsaturated compounds, i.e., $1,\,3$ and $4$ while ammonical $AgNO_3$ $(d)$ reacts only with terminal alkynes, i.e., $3$ and hence $3$ can be distinguished from $1,\,2$ and $4$ by. ammonical $AgNO_3$ $(d)$.

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