Which of the following reactions gives \[{{H}_{2}}C=C=C=C{{H}_{2}}\] [Roorkee Qualifying 1998]

\[2C{{H}_{2}}=CH-C{{H}_{2}}I\underset{{}}{\mathop{\xrightarrow{{}}}}\,\]

\[C{{H}_{2}}Br-CBr=C{{H}_{2}}\xrightarrow{Zn/C{{h}_{3}}OH}\]

\[HC\equiv C-C{{H}_{2}}-COOH\underset{{{40}^{o}}C}{\mathop{\xrightarrow{Aq.{{K}_{2}}C{{O}_{3}}}}}\,\]

\[C{{H}_{2}}Br-C\equiv C-C{{H}_{2}}Br\underset{\text{Heat}}{\mathop{\xrightarrow{Zn}}}\,\]

Which of the following reactions gives \[{{H}_{2}}C=C=C=C{{H}_{2}}\] [

1.	Which of the following reactions gives \[{{H}_{2}}C=C=C=C{{H}_{2}}\] [Roorkee Qualifying 1998]
A.	\[C{{H}_{2}}Br-CBr=C{{H}_{2}}\xrightarrow{Zn/C{{h}_{3}}OH}\]
B.	\[HC\equiv C-C{{H}_{2}}-COOH\underset{{{40}^{o}}C}{\mathop{\xrightarrow{Aq.{{K}_{2}}C{{O}_{3}}}}}\,\]
C.	\[C{{H}_{2}}Br-C\equiv C-C{{H}_{2}}Br\underset{\text{Heat}}{\mathop{\xrightarrow{Zn}}}\,\]
D.	\[2C{{H}_{2}}=CH-C{{H}_{2}}I\underset{{}}{\mathop{\xrightarrow{{}}}}\,\]
Answer» D. \[2C{{H}_{2}}=CH-C{{H}_{2}}I\underset{{}}{\mathop{\xrightarrow{{}}}}\,\]

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