Question

An organic compound having molecular mass 60 is found to contain C = 20% H = 6.67% and N = 46.67% while rest is oxygen. On heating, it gives NH₃ alongwith a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound is

(a) CH₃CH₂CONH₂ 

(b)(NH₂)₂ CO

(c) CH₃CONH₂ 

(d) CH₃NCO

Answer 1

Correct Option (b)(NH₂)₂ CO

Explanation:

Empirical formula = CH₄N₂O

Empirical formula weight

= 12 + (4 x 1) + (2 x 14) + 16 = 60

n = (Mole formula weight/Emp formula weight) = 60/60 = 1

Molecular formula = CH₄N₂O

Given compound gives biuret test, thus given compound is.urea (NH₂)₂CO.