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Isomerisation of Alkynes

CH2CO2Me2 + ...

Question

$C H_{2} (C O_{2} M e)_{2} + (i) N a - ----- \to (i i) A c O H C H (C O_{2} M e)_{3}$
Which of the following reactants will complete the above reaction ?

C H_{2} (C O_{2} M e)_{2}

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(C O_{2} M e)_{2}

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C l - C O_{2} M e

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C O C L_{2}

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Solution

The correct option is C $C l - C O_{2} M e$
$H_{2} C (C O_{2} M e)_{2} + C H_{3} C O C l i i) A c O H - ---- \to i) N a H C (C O_{2} N e)_{3}$
Addition of acylchloride substitutes the hydrogen of methane as electrophilic substitution reaction.
From the above mechanism, $C H_{3} C O C l$ is reactant to complete the reaction.
Option: C

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