In water, H−O−H bond angle is 104.5<sup>o</sup>, but in ethers (R−O−R), the C−O−C bond angle is about 110<sup>o</sup>. The reason to justify it, is:

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118

Organic Chemistry MCQ with Answers

118) In water, H−O−H bond angle is 104.5^o, but in ethers (R−O−R), the C−O−C bond angle is about 110^o. The reason to justify it, is:

Positive inductive effect of alkyl groups is more than that of hydrogen

The alkyl group is polar, while hydrogen is not

Distortion caused by the lone pair of oxygen atom is more than compensated by the bulky alkyl groups

The hybridisation of oxygen atoms is different in ethers and in water

Answer is:

Distortion caused by the lone pair of oxygen atom is more than compensated by the bulky alkyl groups

Explanation:

Bulky groups counter balance the repulsion caused by the lone pairs.

Organic Chemistry MCQ with Answers

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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

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

Organic Chemistry MCQ with Answers

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118) In water, H−O−H bond angle is 104.5o, but in ethers (R−O−R), the C−O−C bond angle is about 110o. The reason to justify it, is:

Distortion caused by the lone pair of oxygen atom is more than compensated by the bulky alkyl groups

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

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

:CCl2

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

Organic Chemistry MCQ with Answers

118) In water, H−O−H bond angle is 104.5^o, but in ethers (R−O−R), the C−O−C bond angle is about 110^o. The reason to justify it, is:

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: