Ketan,
Whether your Company is private company or public Company? Section 180 is not applicable to private company, hence if your company is private limited company, no need to take approval by way of Special Resolution.
If your company is public company, go through following test.
Special resolution is required, when your company selling whole or substantially whole of undertaking.
What is undertaking:
An undertaking in which the investment of company exceeds twenty per cent of its net worth as per the audited balance sheet of the preceding financial year or undertaking which generates twenty per cent. of the total income of the company during the previous financial year.
For example; if net worth of the company is 10 lacs and total income is 5 lacs as per previous financial year. if your company is investing more than 2 lac (more than 20%) in any property that is called as undertaking or from any property generating 1 lac income (20%) such property is called as undertaking.
when your company has undertaking as per above test, than, if company is selling 20% or more of value of undertaking as per the audited balance sheet of the preceding financial year, your company need to take consent of shareholders by way of special resolution.
For Example: value of undertaking is Rs. 3 lacs, when your company is selling 60 thousand value of property (20% or more of undertaking), your company needs to pass special resolution.
I hope you understand issue.