From which one of the following both ethylene and acetylene could be prepared in a single step?

C H_{3} C H_{2} O H

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B r - C H_{2} - C H_{2} - B r

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C H_{3} C H_{2} B r

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B r - C H = C H_{2}

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C H_{3} C O O H

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Solution

The correct option is B $B r - C H_{2} - C H_{2} - B r$
Ethylene is obtained through dehalogenation while acetylene is obtained thorough a double dehydrohalogenation.

$(B r) C H_{2} (B r) N a N H_{2} - ---- \to C H \equiv C H$

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Q. Classify the following reaction in one of the reaction type.

C H_{3} C H_{2} B r + H O^{-} \to C H_{2} = C H_{2} + H_{2} O + B r^{-}

Classify the following reactions in one of the reaction type studied in this unit.
(a) $C H_{3} C H_{2} B r + H S^{-} \to C H_{3} C H_{2} S H + B r^{-}$
(b) $(C H_{3})_{2} C = C H_{2} + H C l \to (C H_{3})_{2} C l C - C H_{3}$
(c) $C H_{3} C H_{2} B r + H O^{-} \to C H_{2} = C H_{2} + H_{2} O + B r^{-}$
(d) $(C H_{3})_{3} C - C H_{2} O H + H B r \to (C H_{3})_{2} C B r C H_{2} C H_{3} + H_{2} O$