Please answer the questions. Thanks!

CASE ANALYSIS: 1. Don Ramon, a rich business tycoon, has lots of idle real estate in the provinces, one of them is a beach front in Siargao. One day, Don Ramon told his agent X that he is selling his Siargao beach property to his friend Carlos but he could not meet Carlos personally because he is not yet fully-vaccinated. So he told X that he is authorizing him to transact in his behalf with Carlos for the sale of the said beach property in Siargao. X agreed and with the verbal instructions of Don Ramon, he proceeded to Siargao in order to close the deal with Carlos and to sign all the documents of sale with him. QUESTION: Is the sale transaction between X and Carlos perfectly valid? 2. Robert is a clinically insane person who developed said episodes of insanity after suffering from depression brought about by Typhoon Ulysses. He legally inherited all that his parents left as the sole heir. His neighbor X is an 18-year old ambitious millennial who has a mind of a budding entrepreneur. In February 2021, X sold his Iphone 12 to Robert at double its original price. At that time, Robert was in his lucid interval although was still undergoing psychiatric treatment for his severe clinical depression. Robert agreed to the sale and paid X the contracted selling price. QUESTION: Is the contract of sale perfectly valid? ANSWER DIRECT TO THE POINT IN NOT MORE THAN 5 SENTENCES PER QUESTION. BEGIN FIRST WITH YOUR ULTIMATE CONCLUSION FOLLOWED BY REASONING AND EXPLANATION