Test Preparation on General Organic Chemistry-III-Chemistry Test Series For NEET-2020

Which of the following is correct with respect to -I effect of
the substituents (R = alkyl)

(a) -NH₂ < -OR < -F    (b) -OR < -NR₂ < -F 

(c) -NH₂ > -OR > -F    (d) -NR₂ > -OR > -F

Isomers have essentially identical

Which one of the following is an optically active compound

Separation of d and l enantiomorphs from a racemic mixture is
called