Aldehydes, Ketones and Carboxylic Acids

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Consider the reactions, [figure] Identify A, X, Y and Z.

1. A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide.
2. A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone.
3. A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone.
4. A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-Hydrazine.

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

1. MnO2
2. Aluminium isopropoxide
3. Acetone
4. Ozone

The product formed by the reaction of an aldehyde with a primary amine is

1. carboxylic acid
2. aromatic acid
3. Schiff's base
4. ketone

The correct order of the strengths of the carboxylic acids [figure] is

1. I > II > III
2. II > III > I
3. III > II > I
4. II > I > III

The correct structure of the product 'A' formed in the reaction [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

1. hydrazine in presence of feebly acidic solution
2. hydrocyanic acid
3. sodium hydrogen sulphate
4. a Grignard reagent.

Which one of the following esters gets hydrolysed most easily under alkaline conditions?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Treatment of cyclopentanone [figure] with methyl lithium gives which of the following species ?

1. Cyclopentanonyl radical
2. Cyclopentanonyl biradical
3. Cyclopentanonyl anion
4. Cyclopentanonyl cation

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

1. 3-pentanone
2. n-amyl alcohol
3. pentanal
4. 2-pentanone