Q.1 ans A .chain isomer
becoz chin is disturbed remaining cCl at 2nd position
Q.2 C both will tautomerise to same extent due to conjugate diene
Q.3 c becoz nN is adjacent to it
Q.4 B & C one electron remain there so paramagnetic
Q.5 C both will react at same rate sN2 reaction depends only on
1.nucleophile
2.medium to which it is carried out
etc.