MCQ
$KCN$ reacts readily to give a cyanide with
  • A
    Ethyl alcohol
  • Ethyl bromide
  • C
    Bromobenzene
  • D
    Chlorobenzene

Answer

Correct option: B.
Ethyl bromide
b
(b)${C_2}{H_5}Br + KCN\xrightarrow{{{\text{alcohol}}}}{C_2}{H_5}CN + KBr$

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Given below are the half-cell reactions :

$Mn^{2+} +2e- \rightarrow Mn;\, E^o = -1.18\,V$

$2(Mn^{3+} +e^- \rightarrow Mn^{2+} )\,;\,E^o=+1.51\,V$

The $E^o$ for $3Mn^{2+} \rightarrow Mn+ 2Mn^{3+}$ will be :