How many $sp^2$ and $sp$-hybridised carbon atoms are present respectively in the following compound?

Which of the following is the simplest amino acid?

$A$ block of mass $0.50 \ kg$ is moving with a speed of $2.00 \ ms^{-1}$ on a smooth surface. It strikes another mass of $1.00 \ kg$ (initially at rest) and then they move together as a single body. The energy loss during the collision is .............. $J$

The condition for the coaxial system $x^2+y^2+2\lambda x+c=0$,where $\lambda$ is a parameter and $c$ is a constant,to have distinct limiting points,is

The formation of which of the following polymers involves a hydrolysis reaction?

Name the gas that can readily decolourise acidified $KMnO_4$ solution.