Please provide me with some mnemonics for organic chemistry so that I can learn some of the difficult reactions easily.

@ nilay 
how can we construct mnemonics for remembering the reaction , 
i am sorry to say there are no mnemonics avaliable for learning the organic name reaction . 
what u have to do for that is at first take a note of all the name reaction avaliable in class 11^th and 12^th . 
then every morning learn at least 10 reaction , suppose today u learnt the first 10 reaction , then for next 3 days , repeat the same , and after 3 days , in the 4^th day , start with anathor 10 reaction . 
and i am sure after some days , u will be master in that , all reaction will be in your mind . 
i could guarentee you on this , same strategies i applied . 
and 2^nd thing u have to remember is that – donot even learn reaction without knowing the nomenclature properly . 
first do nomenclature , then reaction , if u are not done nomenclature . 
HOPE IT CLEARS YOUR DOUBT 

ALL THE BEST ..