In the reaction of phenol with CHCl<sub>3</sub> and aqueous NaOH at 70<sup>o</sup>C, the electrophile attacking the ring is:

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Organic Chemistry
119

Organic Chemistry MCQ with Answers

119) In the reaction of phenol with CHCl₃ and aqueous NaOH at 70^oC, the electrophile attacking the ring is:

CHCl₃

⋅CHCl₂

:CCl₂

COCl₂

Answer is:

:CCl₂

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:

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⁻.

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.

Organic Chemistry MCQ with Answers

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119) In the reaction of phenol with CHCl3 and aqueous NaOH at 70oC, the electrophile attacking the ring is:

:CCl2

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

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

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:

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

Organic Chemistry MCQ with Answers

119) In the reaction of phenol with CHCl₃ and aqueous NaOH at 70^oC, the electrophile attacking the ring is:

:CCl₂

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: