The reaction in which $NaCN/C_2H_5OH/HOH$ is used is:

Which one of the following on oxidation will not give a carboxylic acid with the same number of carbon atoms?

Which of the following is not formed as one of the products in the following reaction?

What is the process of converting an oxime into an amide by rearrangement in the presence of a strong acid called?

Which of the following compounds undergoes maximum hydration?

An organic compound $B$ is formed by the reaction of ethylmagnesium iodide $(CH_3CH_2MgI)$ with a substance $A,$ followed by treatment with dilute aqueous acid. Compound $B$ does not react with $PCC$ in dichloromethane. Identify $A$.