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Dear Jothi,
All the engineering branches share equal difficulty level and thus it would be difficult to tell which will be toughest. However, below is the difference between Civil Engineering and Biotechnology keeping in mind their scopes.
Civil Engineering
It is the conventional branch of study in the engineering field. The course includes the study of planning, designing and implementation of structural activities. The working area of this field includes the jobs that start from the planning, analyzing, designing, supervision and construction of various public works such as bridges, dams, water sewages, etc.
Career opportunities for the B.Tech graduates in this particular branch of study at present are huge. Many job opportunities are there in the public as well as in the private sectors. The infrastructure and real estate industries are booming and requirements for the civil graduates are increasing gradually. They have opportunities in abroad also. Many international infrastructure companies are recruiting them for various constructional works.
If the graduates are opting for higher studies after B.Tech in civil engineering, then many options are there for them to choose. They can pursue this course in master's level as well as at the doctoral level. Many universities in the country offer M.Tech in Civil engineering. Different specializations are available in this branch from which students can choose their area of interest.
Biotechnology engineering:
IT is the study of biology with technology for research & development. The scope of this branch has been on the high in the following fields:
Gene therapy
Tissue culture
Immunotechnologies
Genetic Engineering
Plant-based drugs
Rational drug design
etc.
A Biotechnologist can seek a career in food processing and agro based industries, chemical and textile industries, agricultural sectors, pharmaceutical firms and manufacturing industries, research laboratories, which are run by government or private sector. Professionals can seek job opportunities in private sectors such as , pharmaceutical farms and aquaculture.
The basic eligibility criteria for admission into bachelor's degree is, higher secondary school certificate (10+2) examination with science subject such as Physics, maths/ Bio and chemistry. For admissions into the IITs, the student has to clear the Joint Entrance Examinations (J.E.E).
The duration for the course is 4 years.
Hope this helps
All The Bes!

Dear Praveen,
The basic eligibility for admission in a bachelor’s degree in engineering is successfully completing higher secondary school certificate (10+2) examination with science subject such as physics, maths and chemistry. Admissions are usually done through entrance examinations. However, it is always advisable to get in touch with the institute to get the exact details about the admission procedure as admission process and eligibility vary from institute to institute. For seeking admissions in IITs, it is mandatory to qualify JEE exam.
For the list of institutes, refer to the below link
https://engineering.shiksha.com/be-btech-in-chemical-engineering-courses-in-india-ctpg?sort=none&nl=0#cateSearchBlock
(In the above link, you can refine the search as per your preferred city)
Before seeking admission in any institute, kindly check the below mentioned parameters such as affiliation, accreditation, fee structure, curriculum, admission procedure, entrance exam patterns, etc.
Hope this helps
Thanks
All the Best!