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1.

If we react HCN with grignard reagent then which of the following is obtained?A. AldehydeB. KetoneC. AlcoholD. None

Answer» Correct Answer - A
Discussion
2.

Which of the following compounds is the most reactive towards electrophilic addition reactions?A. `CH_(3)-overset(O)overset(||)C-H`B. `CH_(3)-overset(O)overset(||)C-CH_(3)`C. D.

Answer» Correct Answer - A
Reactivity of carbonyl compounds can be decided by two factors
(i) Steric factor Lesser the steric factor greater will be its reactivity
(ii) Electronic factor Greater the number of alkyl group esser will be its electrophilicity.
Hence, `CH_(3)-CHO` is most reactive towards nucleophilic addition reaction.
Discussion
3.

Which of the following will undergo aldol condensation ?A. `CH_(3)-CHO`B. C. `CH_(3)-overset(O)overset(||)C-CH_(3)`D. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-CHO`

Answer» Correct Answer - B::D
Necessary condition for aldol condensation is the presence of atleast one `alpha` H-atm. Hence, `C_(6)H_(5)CHO" and "(CH_(3))_(3)C"C"HO` do not undergo aldol condenstation as the both do not have any `alpha`-hydrogen atom.
Discussion
4.

Why pH of reaction should be carefully controlled while preparing ammonia derivatives of carbonyl compound?

Answer»

In strongly acidic medium ammonia derivatives being basic will react with acids and will not react with carbonyl compound. In basic medium, OH- will attack carbonyl group. 

 So the pH of a reaction should be carefully controlled. 
Discussion
5.

Which of the following affects electrophilicity of the carbonyl carbonA. Steric hinderanceB. Presence of bulky groupsC. bothD. None

Answer» Correct Answer - C
Discussion
6.

Which of the following can show nucleophilic addition reactionA. HCNB. HClC. HBrD. All of the above

Answer» Correct Answer - A
Discussion
7.

Nucleophilic addition is seen inA. AlkenesB. KetonesC. AldehydesD. Both c and B

Answer» Correct Answer - D
Discussion
8.

Arrange the following in decreasing order of their acidic strength and give reason for your answer. `CH_(3)CH_(2)OH, CH_(3)COOH, ClCH_(2)COOH, FCH_(2)COOH, C_(6)H_(5)CH_(2)COOH`

Answer» `FCH_(2)COOHgtClCH_(2)COOHgtC_(6)H_(5)CH_(2)COOHgtCH_(3)COOHgtCH_(3)CH_(2)OH`
Reasons
(i) More the electron withdrawing nature of substituent, more is the acidic strength.
(ii) Direct attachment of `C_(6)H_(5)` group increases acidity due to resonance and `sp^(2)` hybridisation.
(iii) Alcohols are weakly acidic than carboxylic acids.
Discussion
9.

Assertion : Aromatic aldehydes and formaldehyde undergo Cannizzaro reaction Reason : Aromatic aldehydes are almost as reactive as formaldehyde.

Answer» Correct Answer - c
Assertion is the correct statement but reason is the wrong statement. Aromatic aldehyde and formaldehyde undergo Cannizzaro reaction due to absence of `alpha`-H- atom lead to formation of carboxylic acid and alcohols of corresponding aldehyde.
Discussion