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Objective Questions
GS
GS Set-1
Chemistry
Organic Chemistry
120

Organic Chemistry MCQ with Answers

120) An aromatic ether is not cleaved by HI even at 525 K. The aromatic ether is:

C₆H₅OCH₃

C₆H₅OC₆H₅

C₆H₅OC₃H₇

Tetrahydrofurane

Answer is:

C₆H₅OC₆H₅

Explanation:

Due to greater electronegativity of sp² hybridised carbon atoms of the benzene ring, dialkyl ethers are not attacked by nucleophiles like I⁻.

Organic Chemistry MCQ with Answers

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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:

A primary alcohol

A tertiary alcohol

An alkane

An ether

Answer is:

A primary alcohol

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

But−2−en−1−al

But−3−en−1−al

Prop−2−en−1−al

Ethenyl methanal

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:

Meerwein−Ponddorf reaction

Clemmensen reaction

Wolff−Kishner reaction

Schiff reaction

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:

2−methyl−2−butene

2−methyl−1−butene

2−butene

1−butene

Answer is:

2−methyl−2−butene

Organic Chemistry MCQ with Answers

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120) An aromatic ether is not cleaved by HI even at 525 K. The aromatic ether is:

C6H5OC6H5

Organic Chemistry MCQ with Answers

Related 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:

A primary alcohol

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

Clemmensen reaction

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

2−methyl−2−butene

Organic Chemistry MCQ with Answers

C₆H₅OC₆H₅

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:

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