Question

An organic compound Ⓐ of molecular formula CH₂O reacts with methyl magnesium iodide followed by acid hydrolysis to give Ⓑ of molecular formula C₂H₆O. Ⓑ on reaction with PCl₅ gives Ⓑ. © on reaction with alcoholic KOK gives Ⓓ an alkene as the product. Identif’ Ⓐ Ⓑ Ⓒ Ⓓ and explain the reactions involved.

Answer 1

1. Ⓐ of molecular formula CH₂O is identified as HCHO, formaldehyde. 

2. Formaldehyde reacts with CH₃MgI followed by hydrolysis to give ethanol, CH₃ -CH₂ OH B as the product.

3. Ethanol Ⓑ reacts with PCl₅ to give C₂H₅Cl, Ethyl chloride © as the product.

4. CH₃ -CH₂Cl © on reaction with alcoholic KOH undergoes dehydrohalogenation to give ethylene CH₂ =CH₃ Ⓓ as the product.

A	HCHO	Formaldehyde
B	CH3 - CH2OH	Ethanol
C	CH3-CH2Cl	Ethylchloride
D	CH2- CH2	Ethylene