The correct stability order for the following carbocations is:

Which one of the following generally acts as an antagonist to gibberellins?

Which of the following on thermal decomposition produces both basic and acidic oxides?

$A$ uniform rope of length $L$ and mass $m_1$ hangs vertically from a rigid support. $A$ block of mass $m_2$ is attached to the free end of the rope. $A$ transverse pulse of wavelength $\lambda_1$ is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is $\lambda_2$. The ratio $\lambda_2/\lambda_1$ is

Tetrahalides of group $14$ elements (except that of carbon) act as:

The largest tiger reserve in India is