When acetaldehyde is heated with Fehling solution,a red precipitate is formed. Which of the following is that?

The given diagram shows an ideal gas taken from state $1$ to $2$ through optional paths $A, B, C$. Let $Q, W$,and $\Delta U$ represent the heat supplied to the gas,work done by the gas,and the change in internal energy of the gas,respectively. Which of the following conditions is true?

Total number of secondary amines (excluding stereoisomers) possible with the molecular formula $C_5H_{13}N$ is

$A$ uniform chain has a mass $m$ and length $l$. It is held on a frictionless table with one-sixth of its length hanging over the edge. The work done in just pulling the hanging part back on the table is

Which of the following is known as the pitcher plant?

With increasing principal quantum number,the energy difference between adjacent energy levels in $H$ atom