Ethyl ethanoate is treated with excess CH3MgBr in dry ether and then H3O+ to give A (along with ethanol). A is heated with concentrated H2SO4 to give B, and B is subjected to ozonolysis followed by Zn/H2O. The products of ozonolysis are

JEE Advanced levelSingle correct optionDifficulty 3 of 3si147

Ethyl ethanoate is treated with excess $CH X_{3} MgBr$ in dry ether and then $H X_{3} O X^{+}$ to give A (along with ethanol). A is heated with concentrated $H X_{2} SO X_{4}$ to give B, and B is subjected to ozonolysis followed by $Zn / H X_{2} O$ . The products of ozonolysis are

An ester reacts with two moles of the Grignard reagent:

CH X_{3} COOC X_{2} H X_{5}

gives

(CH X_{3}) X_{3} COH

(A, 2-methylpropan-2-ol). Dehydration gives 2-methylpropene (B). Ozonolysis of

(CH X_{3}) X_{2} C = CH X_{2}

gives

CH X_{3} COCH X_{3}

and

HCHO