Give a reason for each of the following: (a) Formaldehyde does not undergo aldol condensation, but…

Give a reason for each of the following: (a) Formaldehyde does not undergo aldol condensation, but acetaldehyde does. (b) Chloroacetic acid is stronger acid than acetic acid. (c) Both aldehydes and ketones undergo a number of nucleophilic addition reactions.

An organic compound with the molecular formula $\text{C}_7\text{H}_6\text{O}$ gets oxidised by Tollens' reagent. It does not respond to Fehling test but can undergo the Cannizzaro reaction. Identify the compound. Show how you used the above information to identify the compound.