Organic Chemistry MCQ with Answers

Organic Chemistry MCQ with Answers

121) A compound is soluble in conc. H₂SO₄. It does not decolourise bromine in carbon tetrachloride but is oxidised by chromic anhydride in aqueous sulphuric acid within 2 seconds, turning orange solution to blue, green and then opaque. The original compound is:

Answer is:

A primary alcohol

122) IUPAC name of aldol condensation product between formaldehyde and acetaldehyde is:

Answer is:

Prop−2−en−1−al

123) In a reaction, RCHO is reduced to RCH₃ using amalgamated zinc and conc. HCl, and warming the solution. The reaction is known as:

Answer is:

Clemmensen reaction

Explanation:

In Clemmensen reduction, aldyhydes and ketones are reduced into hydrocarbons.

124) One mole of alkene X, on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of X is:

Answer is:

2−methyl−2−butene

125) The synthesis of crotonaldehyde from acetaldehyde is an example of which reaction?

Answer is:

Nucleophilic addition−elimination

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