Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Phosphine is obtained by (1) \[C{{a}_{3}}{{P}_{2}}+{{H}_{2}}O\xrightarrow{{}}\] (2) \[{{P}_{4}}+NaOH\xrightarrow{{}}\] (3) \[CHC{{l}_{3}}+{{O}_{2}}\xrightarrow{{}}\] (4) \[CC{{l}_{4}}+{{O}_{2}}\xrightarrow{{}}\]A) 1, 2 and 3 are correct.
B) 1 and 2 are correct.
C) 2 and 4 are correct.
D) 1 and 3 are correct.
Correct Answer: B
Solution :
Phosphine is obtained either by treating calcium phosphite with water or by treating white phosphorus with alkali. \[\underset{\begin{smallmatrix} \,\,\,calcium \\ phosphite \end{smallmatrix}}{\mathop{C{{a}_{3}}{{P}_{2}}}}\,+6{{H}_{2}}O\xrightarrow{{}}\underset{phosphine}{\mathop{2P{{H}_{3}}}}\,+3Ca{{(OH)}_{2}}\] \[\underset{\begin{smallmatrix} \,\,\,\,\,white \\ phosphorus \end{smallmatrix}}{\mathop{{{P}_{4}}+}}\,3NaOH+3{{H}_{2}}O\xrightarrow{Warm}\underset{phosphine}{\mathop{P{{H}_{3}}}}\,\] \[+3Na{{H}_{2}}P{{O}_{2}}\]
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