Question

Which of the following is necessary for
the synthesis of diethyl malonate?
A
Acetic acid
B
Potassium cyano acetate
С
Ethyl acetate
D
Methyl acetate​

Answer 1

acetic acid

its the answer....

Answer 2

Answer:

Acetic acid undergoes several steps to form diethyl malonate.

Explanation:

Diethyl malonate is an ester with a molecular formula of $(CH_{2}COO) _{2}CH_{2}$.

Acetic acid on reaction with chlorine forms chloroacetic acid. when it is treated with sodium carbonate, the hydrogen atom gets replaced by a sodium atom. Further, on treatment with sodium cyanide, the chlorine atom gets replaced by a cyanide ion. Later, on treatment with sodium hydroxide at high temperature, and ethanol in presence of sulfuric acid, diethyl malonate will be formed.

$CH_{3} COOH\ +Cl_{2}---- > CH_{2}Cl COOH \\CH_{2}Cl COOH+ Na_{2}CO_{3} -- > CH_{2}Cl COONa\\CH_{2}Cl COONa+NaCN--- > CH_{2}CN COONa\\CH_{2}CN COONa+NaOH---- > NaOCH_{2} COONa\\NaOCH_{2} COONa+C_{2}H_{5}OH--- > (CH_{2}COO) _{2}CH_{2}$

In the above synthesis, acetic acid is a starting material that is necessary for the synthesis of diethyl malonate.