The ascending limb of the Loop of Henle is permeable to which of the following?

Which one of the following statements is incorrect?

Which of the following is a $C_4$ plant?

Let $\overrightarrow{a}=\hat{i}-2 \hat{j}+3 \hat{k}$,$\overrightarrow{b}=2 \hat{i}+3 \hat{j}-\hat{k}$ and $\overrightarrow{c}=\lambda \hat{i}+\hat{j}+(2 \lambda-1) \hat{k}$. If $\overrightarrow{c}$ is parallel to the plane containing $\overrightarrow{a}$ and $\overrightarrow{b}$,then $\lambda$ is equal to

The structure of $IF_7$ is $......$ .

Which one has the highest boiling point?