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Model Paper 5 — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryModel Paper 51 Mark
MCQ
The catalyst required for the given reaction is
$
HC=CH+\text { dil. } H_2 SO_4 \xrightarrow{\text { Catalyst }} CH_3 CHO
$
  • A
    Pd
  • B
    $AlCl _3$
  • C
    Pt
  • ✓
    $HgSO _4$
✓

Answer

Correct option: D.
$HgSO _4$
(d) $HgSO _4$
Explanation: Alkynes are not readily hydrated due to their low reactivity towards electrophilic addition reactions.Further dilute $H _2 SO _4$ has no effect on carbon carbon triple bond. In the presence of HgSO 4 as catalyst, hydration occurs readily.

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