Investing in Section 54EC Capital Gains Bonds

I might be investing in Part 54EC capital features bonds, from the proceedings of sale of a property.

There are 4 such bonds based mostly on my data.

I want to know the Execs and Cons of every of those 4 bonds

Ought to the funding be divided in every of the 4?

Rural Electrification Company Restricted or REC bonds

Nationwide Freeway Authority of India or NHAI bonds

Energy Finance Company Restricted or PFC bonds

Indian Railway Finance Company Restricted or IRFC bonds