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Question
Compound A is bubbled through bromine dissolved in carbon tetrachloride, and the product is CH2Br - CH2Br.
\[\ce{A ->[Br2/CCl4] CH2Br - CH2Br}\]
- Draw the structural formula of A.
- What type of reaction has A undergone?
- What is your observation?
- Name (not formula) the compound formed when steam reacts with A in the presence of pliosphoric acid.
- What is the procedure for converting the product of (iv) back to A?
Solution
- CH2 = CH2
- Addition reaction
- Reddish brown colour of bromine gets discharged
- \[\ce{\underset{Ethene}{CH2 = CH2} + H2O ->[Phosphoric][acid] \underset{Ethanol}{CH3 - CH2 - OH}}\]
- By dehydration (with any dehydrating agent)
\[\ce{\underset{Ethanol}{C2H5OH} ->[Al2O3][300^\circ C] \underset{Ethene}{C2H4} + H2O}\]
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\[\begin{array}{cc}
\phantom{.}\ce{H\phantom{...}H\phantom{...}O}\phantom{..}\\
\phantom{.}|\phantom{....}|\phantom{....}||\phantom{..}\\
\ce{H - C - C - C - OH}\\
\phantom{}|\phantom{....}|\phantom{......}\\
\phantom{}\ce{H\phantom{...}H}\phantom{......}
\end{array}\]
