Question

For each of the following pairs of compounds, circle the one that is the stronger acid: Which one of the following is the MOST stable carbocation? Circle the correct answer.

Answer 1

stronger acid --> has a higher tendency to release H+ ions in solution

so..

i)

Cl makes this a stronger dipole molecule, this will favour H+ ions formation

so

choose Cl- contianing specie (left side)

ii)

the alcohol R-OH will be the one releasing its H+

NO2 is pretty electronegative (plenty of electrons) compared to Bromine

then

choose NO2- containing materila

iii)

NH3+ can donate H to form NH2 an dH+

O-CH3 is slightly more polar, therefore choose this one

iv)

choose the one with NO CH3

since the CH3 increases mass and distance, therefore the dipole interaction becomes lower... we require high interaction so H+ is released