1. Tardigrade
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  3. Chemistry
  4. B xleftarrow[ textCatalyst] textLindlar's R - C≡ C - R xrightarrowNa/NH3 A A and B are geometrical isomers (R - CH = CH - R)-

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Q. $B \xleftarrow[\text{Catalyst}]{\text{Lindlar's}} R - C\equiv C - R \xrightarrow{Na/NH_3} A$
A and B are geometrical isomers $\left(R - CH = CH - R\right)-$

Hydrocarbons

Solution:

Birch reduction gives tram product and Lindlar’s catalyst gives cis product