Class 12th

This is a Matching Type Questions as classified in NCERT Exemplar

 Ans: (i) →  (d); (ii) →  (e); (iii) →  (a); (iv) →  (b); (v) →  (c)

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: D

The silver mirror test can be used to determine Tollen's. [Ag (NH₃)₂] + OH ^- . Only aldehydes, not ketones, react with Tollen's reagent to create silver.

A silver mirror test is not given with this affirmative test.

The carbonyl group is present in both aldehyde and ketone.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: C

There is no alpha hydrogen atom in the Cannizaro process. Formaldehyde and aromatic aldehydes do not contain alpha hydrogen. It proceeds through the Cannizaro reaction. Formaldehyde is the most reactive of all aldehydes.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: D

Because of the presence of electron withdrawing carbonyl groups, the alpha hydrogen atom in carbonyl compounds is acidic. In nature, hydrogen is very acidic.

Because the cation is released in the form of H⁺ , the anion created after the loss of the -hydrogen atom is resonance stabilised.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: E

The two reactions produce different products for different reasons. One involves the oxidation of aldehydes, while the other involves the reduction of carboxylic acids. Aldehydes are easily oxidised by mild oxidising agents, hence compounds containing  - CHO are rapidly oxidised.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: A

The smallest aldehyde is formaldehyde. It features a triangular planar shape with two bond pairs and no lone pairings. C and O share one pair of electrons in their double bond. As a result, the C atom is sp² hybridised. As a result, both Assertion and Reason are true.

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Correct options: A and B 

The given compound is a planar molecule with sp2 hybridised carbon. Carbon atoms are attacked by nucleophiles. If the nucleophile approaches from the front, the A and B molecules shift to the front and back positions, respectively, and the carbon becomes tetrahedral. Another alternative is that A and B molecules will be located above and below the plane, respectively. As a result, the choices C and D aren't represented as planar molecules.

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Correct options: A and B

A: Benzophenone can be obtained by Friedel-craft acylation reaction 

B: Benzophenone can also be obtained by the reaction between benzoyl chloride and diphenyl cadmium.