निम्नलिखित अभिक्रिया अनुक्रमों पर विचार कीजिए और सही विकल्प चुनिए।

Reduction of alkyne with Na/liq. NH3 gives trans-alkene (L) while with Lindlar's catalyst gives cis-alkene (K). Subsequent addition of HBr to cis and trans alkenes yields diastereomers (M and N), which are geometrical isomers.