20 what is the base-conjugate acid pair when a strong acid is added to methylamine, ch3nh2? base: ch3nh-; conjugate acid: ch3nh2 base: ch3nh3+; conjugate acid: ch3nh2 base: ch3nh2; conjugate acid: ch3nh3+ base: ch3nh2; conjugate acid: ch3nh-

  The base  conjugate   acid pair  when strong acid is added  to  methylamine  CH3NH2   is

base CH3NH2; conjugate  acid: CH3NH3 +

                 Explanation

When   a base CH3CH2   accept   proton  it  form  its  conjugate  acid  which known as methyl  ammonium  ion. Therefore conjugate  acid  of CH3CH2  is CH3NH3+  ion

For   example  when CH3CH2  react with  HCl

CH3CH2  +HCl → CH3CH3+   +   Cl- 

In order to become stable atoms attract one another to fill their octet and become stable however the closer they get the electron cloud surrounding the nuclei repel each other as they are carrying like charges. due to this reason the atom begins to move away from one another. the bond length or the distance at which the two atoms stabilise their attraction and repulsion is what we call the bond length.