Class 12th

If a, b, $\gamma$ , $\delta$ , are the roots of the equation x⁴ + x³ + x² + x + 1 = 0, then ${\alpha }^{2021}+{\beta }^{2021}+{\gamma }^{2021}+{\delta }^{2021}$  is equal to:

The total number of functions, f : {1,2,3,4} -> {1,2,3,4,5,6} such that f(1) + f(2) = f(3), is equal to:

Given below are two statements:

Statement I: On heating with KHSO₄, glycerol is dehydrated and acrolein is formed.

Statement II:  Acrolein has fruity odour and can be used to test glycerol's presence.                  

Choose the correct option.

Drugs used to bind to receptors inhibiting its natural function and blocking a message are called:

During the denaturation of proteins, which of these structure will remain intact?

Melamine polymer is formed by the condensation of:

 

An organic compound 'A' on reaction with NH₃ followed by heating gives compound B. Which on further strong heating gives compound C(C₈H₅NO₂). Compound C on sequential reaction with ethanolic KOH, alkyl chloride and hydrolysis with alkali gives a primary amine. The compound A is:

Which one of the following reactions does not represent correct combination of substrate and product under the given condition?

Most stable product of the following reaction is:

In the following reaction

The % yield for reaction I is 60% and that of reaction II is 50%. The overall yield of the complete reaction is___________%