Q24. Which of the following is incorrect?
(a) CH3-CH2-OH (H2SO4, Con/443 K) → CH2=CH2 + H2O
(b) CH3-

Q: What is the correct answer for CUET UG Chemistry Q24?

The correct answer is b. Let's analyze each reaction:(a) Ethanol (CH3CH2OH) undergoes dehydration in the presence of concentrated H2SO4 at 443 K to form ethene (CH2=CH2) and water. This is a correct reaction.(b) 2-Methylpropan-2-ol (a tertiary alcohol) on heating with Cu at 573 K undergoes dehydration to form an alkene (2-methylpropene), not dehydrogenation to a ketone and methane. So, CH3-C(CH3)(OH)-CH3 should give CH2=C

Q: Q24. Which of the following is incorrect? (a) CH3-CH2-OH (H2SO4, Con/443 K) → CH2=CH2 + H2O (b) CH3-C(CH3)(OH)-CH3 (Cu, 573 K) → CH3-C(CH3)=O + CH4 (c) CH3-CH(OH)-CH3 (85% H3PO4) → CH3-CH=CH2 +…

The correct answer is b. Let's analyze each reaction:(a) Ethanol (CH3CH2OH) undergoes dehydration in the presence of concentrated H2SO4 at 443 K to form ethene (CH2=CH2) and water. This is a correct reaction.(b) 2-Methylpropan-2-ol (a tertiary alcohol) on heating with Cu at 573 K undergoes dehydration to form an alkene (2-methylpropene), not dehydrogenation to a ketone and methane. So, CH3-C(CH3)(OH)-CH3 should give CH2=C

Q: What are the options for this CUET UG Chemistry question?

A. CH3-CH2-OHH2SO4Con/443 K→ CH2=CH2+H₂O · B. CH3CH2-C-OHCH3Cu573CH3C=O+CH4 · C. CH3CH3-CH-CH3OH85%H3PO4→ CH3-CH=CH2 + H2O · D. CH3-CH2-OHCu573 KCH3CHO + H2

Question

Q24. Which of the following is incorrect?
(a) CH3-CH2-OH (H2SO4, Con/443 K) → CH2=CH2 + H2O
(b) CH3-C(CH3)(OH)-CH3 (Cu, 573 K) → CH3-C(CH3)=O + CH4
(c) CH3-CH(OH)-CH3 (85% H3PO4) → CH3-CH=CH2 + H2O
(d) CH3-CH2-OH (Cu, 573 K) → CH3CHO + H2

FirstInTest · Accepted Answer

Let's analyze each reaction:(a) Ethanol (CH3CH2OH) undergoes dehydration in the presence of concentrated H2SO4 at 443 K to form ethene (CH2=CH2) and water. This is a correct reaction.(b) 2-Methylpropan-2-ol (a tertiary alcohol) on heating with Cu at 573 K undergoes dehydration to form an alkene (2-methylpropene), not dehydrogenation to a ketone and methane. So, CH3-C(CH3)(OH)-CH3 should give CH2=C(CH3)CH3 + H2O. The given product CH3-C(CH3)=O + CH4 is incorrect.(c) Propan-2-ol (CH3CH(OH)CH3) undergoes dehydration in the presence of H3PO4 to form propene (CH3-CH=CH2) and water. This is a correct reaction.(d) Ethanol (CH3CH2OH) on heating with Cu at 573 K undergoes dehydrogenation (oxidation) to form ethanal (CH3CHO) and hydrogen gas (H2). This is a correct reaction.Therefore, reaction (b) is incorrect.

Answer

CH3-CH2-OHH2SO4Con/443 K→ CH2=CH2+H₂O

Answer

CH3CH2-C-OHCH3Cu573CH3C=O+CH4

Answer

CH3CH3-CH-CH3OH85%H3PO4→ CH3-CH=CH2 + H2O

Answer

CH3-CH2-OHCu573 KCH3CHO + H2

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