NEET Chemistry Aldehydes Ketones Carboxylic Acids Class 12 Questions
29 questions
An organic compound (X) with molecular formula C₉H₁₀O gives positive 2,⁴⁻DNP and Tollens' tests. It undergoes Cannizzaro reaction and on vigorous oxidation it gives 1,⁴⁻benzenedicarboxylic acid. Compound (X) is
Assertion: Etard reaction helps to stop the oxidation of toluene at the aldehyde stage. Reason: Chromyl chloride oxidises methyl group to a chromium complex, which on hydrolysis gives corresponding benzaldehyde.
Given below are two statements : Statement-I : The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole-dipole interactions. Statement-II : The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H⁻bonding. In the light of the above statements, choose the most appropriate answer from the options given below:
Compound P(C₆H₅O) gives a red orange precipitate with 2,⁴⁻DNP reagent and it does not reduce Fehling’s reagent. On drastic oxidation with chromic acid, P gives an aromatic product Q that produces effervescence on treating with aq. NaHCO₃. Compounds P and Q, respectively, are:
The correct order of decreasing acidity of the following aliphatic acids is :
The major product of the following reaction is:
Identify the suitable reagent for the following conversion.
Identify the correct reagents that would bring about the following transformation. <svg>CH₂-CH=CH₂ → CH₂-CH₂-CH₂-CHO</svg>
Fehling’s solution ‘A’ is
For the given reaction: C₆H₅C≡CH + KMnO₄/H⁺ → ‘P’ (major product)
Identify product (A) in the following reaction:
Identify the major product obtained in the following reaction :
Identify the final product [D] obtained in the following sequence of reactions.
Which compound amongst the following is NOT an aromatic compound?
Given below are two statements: Statement I: The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole-dipole interactions. Statement II: The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H⁻bonding. In the light of the above statements, choose the most appropriate answer from the options given below:
Which one of the following is NOT formed when acetone reacts with²⁻pentanone in the presence of dilute NaOH followed by heating?
Match List - I with List - II.
The intermediate compound ‘X’ in the following chemical reaction is: CH₃ + CrO₂Cl₂ CS₂ → X H₃O⁺ →
Identify compound X in the following sequence of reactions: CH₃ (C₆H₅) → Cl₂/hν → X → H₂O/373 K → CHO (C₆H₅)
Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as:
The major product of the following reaction is
Compound A, C₈H₈O, is found to react with NaOH (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively __________.
Carboxylic acids have higher boiling points than corresponding aldehydes, ketones and even alcohols of comparable molecular masses. It is due to their
Identify the major products P, Q and R in the following sequence of reactions.
Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?
Consider the following reactions: i. X →[C₆H₆O] Cu, 573 K → [Ag(NH₃)₂]⁺ Silver mirror observed ii. NH₂−NH−C−NH₂ → Z Identify A, X, Y and Z.
An organic compound ‘X’ having molecular formula C₄H₈O₂ yields phenyl hydrazone and gives negative response to the iodoform test and Tollen’s test. It produces n-pentane on reduction. ‘X’ could be ______.
Which one is most reactive towards nucleophilic addition reaction?
On hydrolysis of a 'compound', two compounds, are obtained. One of which on treatment with sodium nitrite and hydrochloric acid gives a product which does not respond to iodoform test. The second one reduces Tollen's reagent and Fehling's solution. The 'Compound' is: