The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha -carbon, is

• a carbonyl compound with a hydrogen atom on its alpha -carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.

• a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation

• a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism

• a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism

Which of the following reagents would distinguish cis-cyclopenta-1-,2-diol from the trans isomer?

• Ozone

• MnO₂

• Aluminium isopropoxide

• Aluminium isopropoxide

Treatment of cyclopentanone 

methyl lithium gives which of the following species?

• Cyclopentanonyl anion

• Cyclopentanonyl cation

• Cyclopentanonyl radical

• Cyclopentanonyl biradical

414.

Given,


Which of the given compounds can exhibit tautomerism?

• I and II

• I and III

• II and III

• II and III

An organic compound X having molecular formula C₅H₁₀O yields phenyl hydrazone and gives negative response to the iodoform test and tollen test. It produces n -pentane on reduction X could be

• pentanal

• 2-pentanone

• 3-pentanone

• 3-pentanone

Which one is most reactive towards nucleophilic addition reaction?

The reaction by which benzaldehyde cannot be prepared? 

•  +CrO₂Cl₂ and CS₂ followed by H₃O⁺
•  +H₂ in presence of anhydrous AlCl₃.
•  +CO +HCl in presence of anhydrous AlCl₃
•  +CO +HCl in presence of anhydrous AlCl₃

CH₃CHO and C₆H₅CH₂CHO can be distinguished chemically by

• Benedict test

• Iodoform test

• Tollen's reagent test

• Tollen's reagent test

Predict the products in the given reaction,

Acetone is treated with an excess of ethanol in the presence of hydrochloric acid. The product obtained is.