Question

12. What is the correct structure for phenylbenzoate?

Answer 1

12. Name of the given compounds are as follow

So the correct answer is (a)

iglal phenyl acetate phenyl benzoate benzyl 2-phenylacetate methyl benzoate

13.

There are five main types of acyl derivatives. Acid halides are the most reactive towards nucleophiles, followed by anhydrides, esters, and amides. Carboxylate ions are essentially unreactive towards nucleophilic substitution, since they possess no leaving group.

ROCI Rí 0R2ROR RNR2 R0-

A major factor in determining the reactivity of acyl derivatives is leaving group ability, which is related to acidity. Weak bases are better leaving groups than strong bases; a species with a strong conjugate acid (e.g. hydrochloric acid) will be a better leaving group than a species with a weak conjugate acid (e.g. acetic acid). Thus, chloride ion is a better leaving group than acetate ion. The reactivity of acyl compounds towards nucleophiles decreases as the basicity of the leaving group increases, as the table shows.

Compound Name Structure Leaving Group pkg of Conjugate Acid Acetyl chloride CI- Acetic anhydride 4.76 Ethyl acetate 15.9 Acetamide "NH2 NH2 Acetate anion N/a N/a

Therefore anhydride be most reactive followed by esters and finally the aminds. Here we have two esters. We know that alkyl groups are electron releasing groups which increse the elctron density in the compound. Hence the compund having isopropl group adacent to carbonyl will increase the electron density around the carbonyl and will make it less reative towards nucleophile. So the correct option be (b)  

14. As we have mention the reactivity order of carbonyl as

ROCI Rí 0R2ROR RNR2 R0-
therefore the correct option be (d)

15.

CH₂ CH2 - C - 4 NEN Call - (0) CH3CH ₂ C - CHNEN CH2-NEN I I-do zmo -NEN H CH3-CH 2 -CH 2 - 1 4 - EN CH3-NEN – CH₂ll + Na hog