$C_{2} D_{2} L i / a q . N H_{3} - ----- \to C_{2} D_{2} H_{2} (t r a n s)$
This reaction mechanism proceeds through:

electrophilic addition

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nucleophilic addition

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free radical addition

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None of these

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Solution

The correct option is C free radical addition
Alkynes in the presence of Lindlars catalyst, sodium free radical in liquid ammonia reduces to trans- alkenes. Here the neutral sodium is the radical having one electron on it, and the hydrogen is added in trans on the alkenes, they are called as the free radical addition reactions.

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The only CORRECT combination in which the reaction proceeds through radical mechanism is:

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C2D2Li/aq.NH3−−−−−−→C2D2H2 (trans)This reaction mechanism proceeds through:

$C_{2} D_{2} L i / a q . N H_{3} - ----- \to C_{2} D_{2} H_{2} (t r a n s)$
This reaction mechanism proceeds through: