Plz explain this... r ch ch-cd, cd cd cd-cd ch, ch -cd ch-ch, (7) na nh /hc=cno (8) hc ch

4>3>2>1 in this we have to see the inductive effect and deuterium has high inductive effect than hydrogen. so more the +I more the stability. CI3>cd3> CH3 inductive effect order.

4>3>2>1 explanation- heavier the isotope more is the +I effect. here +I CI3 > CD3> CH3

4>3>2>1 Inductive effect (+I )of CT3>CD3>CH3. So more is the number of CD3 group more is the +I effect and hence more is the stability