The compound which has one isopropyl group is:

The metal used for the de-bromination reaction of $1, 2-dibromoethane$ is:

$A$ mixture of plane polarised and unpolarised light falls normally on a polarizing sheet. On rotating the polarizing sheet about the direction of the incident beam,the transmitted intensity varies by a factor of $4$. Find the ratio of the intensities $I_P$ and $I_0$,respectively of the polarized and unpolarized components in the incident beam.

Each category of taxonomic hierarchy is referred to as a unit of . . . . . . .

In adiabatic compression,the decrease in volume is associated with

The condition that $f(x)=a x^3+b x^2+c x+d$ has no extreme value, is