निम्नलिखित में से कौन सा यौगिक मेथिलमैग्नीशियम ब्रोमाइड के साथ अभिक्रिया और उसके बाद जलअपघटन करने पर द्वितीयक अल्कोहल देता है?

An organic compound 'P' has molecular formula C5H10O2. It gives positive iodoform test but does not reduce Tollen's reagent. On hydrolysis with dilute acid, 'P' forms two compounds 'Q' and 'R'. Compound 'Q' gives positive Tollen's test, while compound 'R' gives positive iodoform test. The structure of 'P' is:

Which among the following phenols has the highest melting point?