Vitamin $K$ is required for:

Which of the following reagents when heated with ethyl chloride,forms ethylene?

The Bohr orbit radius for the hydrogen atom $(n = 1)$ is approximately $0.530 \ \mathring{A}$. The radius for the first excited state $(n = 2)$ is ............. $\mathring{A}$.

The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit (in $A$)?

If $\alpha$ is a non-real root of the equation $x^6-1=0$,then $\frac{\alpha^2+\alpha^3+\alpha^4+\alpha^5}{\alpha+1}$ is equal to

If the sum of the roots of the equation $x^2 + px + q = 0$ is three times their difference,then which of the following is true?