Trichloroacetaldehyde was subjected to Cannizzaro’s reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is :

The strongest acid amongst the following compounds is :

Sodium ethoxide has reacted with ethanoyl chloride. The compound that is produced in the above reaction is

One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is