option D
sp hybridised carbon are most electronegative.
+I effect decreases the acidity of carboxylic acid and -I effect increases the acidity. More is the electronegativity more...
option B
Explanation-
in case of I and II, there is only +I effect. while in case of III and IV there is +R effect of pi bond.
if we talk about I and II, I has more +I effect tha...