Ok sir, i have got it :that means that because buy back of shares under section 77A is a Diminution of Capital , not being reduction of capital, hence it will not attract the procedure for reduction of capital as laid down in section 100 . This is because reduction of capital involves :
1)reduction of liability of members in respect of members in respect of unpaid or uncalled liability,
2)Extinguishment of liability of members in respect of uncalled or unpaid share capital.
3) Paying off paid up capital not required for the purposes of of the company
4)Writing off or cancellation of capital which has been lost or is under represented by the available assets.
On the other hand, Buy Back of shares under section 77A, all the shares or other specified securities for buy back should be fully paid up. [ Section 77A(2)(e)]
Is this answer fine sir?? Thanks a lot for sparing ur valuable time in solving my quiry :)