MCQ
$H_2S$ gas changes a filter paper dipped in lead accetate solution into
- ✓Black
- BRed
- CGreen
- DYellow
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$(i)$ $C{H_3} - C \equiv C - C{H_3}$
$(ii)$ $C{H_3} - C{H_2} - C{H_2} - C{H_3}$
$(iii)$ $C{H_3} - C{H_2} - C \equiv CH$
$(iv)$ $C{H_3} - CH = C{H_2}$
The correct order of their acidity is 
If $Y$ gives precipitate with $AgNO_3 ,$ then $Z$ does not undergo reaction with