what should be chosen between iiit allahabad E&C & dce instrumentation&cont or dce civil? Is instrumentation &cont a good branch in terms of placement & job availability?

the best option is to take dce civil.

And you should be knowing that in present scenario the demand of civil engineers is increasing day by day, the reason being the growing infrastructure everywhere around you.Civil eng. has got a very promising future nowadays,and its scope is not going to fade atleast for the next three decades.And b.tech in civil from dceis really going enhance ur resume very much and you should be realy happy that u have a chance to pursue b.tech in civil eng. from dce so my best advice would be go for civil at dce.

instrumentation & cont is also a good branch, but it would be better to take civil. coz there are large number of big companies in field of civil engg than in field of instrumentation & cont. Also the packages given by companies to civil enggs is generally very good