Answer the question on the basis of passage given below Formaldehyde is the first member of the aldehydic series. It is present in green leaves of plants where its presence is supposed to be due to the reaction of CO2 with water in the presence of sunlight and chlorophyll. Commercially, formaldehyde is obtained by the controlled oxidation of methane in the presence of molybdenum oxide (MoO) acting as a catalyst. Formaldehyde is a constituent of a number of polymers also called resins. These are non-volatile solids or semi-solids which are obtained directly from certain plants and can be synthesized in the laboratory.
Benzaldehyde is less reactive towards nucleophilic addition reactions than formaldehyde because:
- I effect of > C = O group and steric factor due to phenyl group
The correct answer is (b) - I effect of > C = O group and steric factor due to phenyl group. In benzaldehyde, the phenyl group attached to the carbonyl group donates electron density through resonance (-I effect) which decreases the electrophilicity of the carbonyl carbon, making it less reactive towards nucleophilic addition reactions. The steric hindrance of the phenyl group also reduces the accessibility of the carbonyl carbon to nucleophiles.
Important Questions from Organic Compounds Containing Nitrogen
The correct increasing order of basic strength of amine is:
(A) C₆H₅NH₂ < NH₃ < C₆H₅CH₂NH₂ < C₂H₅NH₂ < (C₂H₅)₂NH
(B) NH₃ < C₆H₅NH₂ < C₆H₅CH₂NH₂ < C₂H₅NH₂ < (C₂H₅)₂NH
(C) C₆H₅CH₂NH₂ < C₆H₅NH₂ < NH₃ < C₂H₅NH₂ < (C₂H₅)₂NH
(D) C₂H₅NH₂ < (C₂H₅)₂NH < C₆H₅NH₂ < NH₃
(E) NH₃ < C₂H₅NH₂ < C₆H₅CH₂NH₂ < (C₂H₅)₂NH < C₆H₅NH₂
Choose the correct answer from the options given below:
In which of the following molecules carbon atom marked with asterisk (*) is a stereocentre or chiral centre?
Match List-I with List-II:
List-I List-II (A) Urease (I) Maltose (B) Maltase (II) Glucose and fructose (C) Invertase (III) NH₃ and CO₂ (D) Diastase (IV) Glucose Choose the correct answer from the options given below:
Phenol is manufactured from hydrocarbon, Cumene. Cumene is chemically:
t99.9% with respect to t90% for a first-order reaction is:
