Which of the following does not contain any co-ordinate bond?

$A$ liquid drop of diameter $D$ breaks into $27$ tiny drops. The change in energy is

Animals devoid of respiratory,excretory,and circulatory organs are:

The oxidation states of $S$ atoms in Caro's and Marshall's acids are

$X$-rays of wavelength $0.140 \ nm$ are scattered from a block of carbon. What will be the wavelength of $X$-rays scattered at $90^{\circ}$ (in $nm$)?

$A$ ball is thrown upward with an initial velocity $V_0$ from the surface of the earth. The motion of the ball is affected by a drag force equal to $m \gamma v^2$ (where $m$ is the mass of the ball,$v$ is its instantaneous velocity,and $\gamma$ is a constant). The time taken by the ball to rise to its zenith is: