Identify a class of compounds that has a functional

Consider the following in regards to Surajkund International Crafts Mela:

1.It is the largest crafts fair in the world

If the sum of the roots of the quadratic equation 5x² + bx + 4 = 0 is 9. then find the value of b.

Which of the following IITs is in a partnership with NASA-Caltech and the University of Gothenburg, Sweden, to design a low cost camera setup?

Which of the following Harappan sites is thought to have direct sea trade links with Mesopotamia?

A sum of Rs. 591 is divided among X, Y and Z such that X gets Rs. 136 more than Y. Y gets Rs. 58 more than Z. Find the share of Z? 

Which of the following places is a harnessing site for geothermal energy in India?

Disguised unemployment exists primarily in the ________ sector in our country.

What is the maximum amount of gratuity that can be paid under the Payment the Gratuity Act 2018 (Amendment)? 

Number of protected workmen in an establishment =