The reaction that is least feasible is :

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$4 Li + O_{2} ⟶ 2 {Li}_{2} O$

$2 C_{6} H_{5} C \equiv CH + 2 Li ⟶ 2 C_{6} H_{5} C \equiv CLi + H_{2}$

${Li}_{2} {CO}_{3} ⟶ {Li}_{2} O + {CO}_{2}$

$6 Li + N_{2} ⟶ 2 {Li}_{3} N$

answer is A.

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Detailed Solution

Without heating, thermal decomposition will not take place. $Li$ in open air gives ${Li}_{2} O$ and ${Li}_{3} N$ rapidly. Thus, least feasible reaction is :

${Li}_{2} {CO}_{3} ⟶ {Li}_{2} O + {CO}_{2}$ .

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