Advertisements
Advertisements
Why are aryl halides less reactive towards nucleophilic substitution reactions than alkyl halides?
Concept: undefined >> undefined
Which of the following compounds will give butanone on oxidation with alkaline \[\ce{KMnO4}\] solution?
Concept: undefined >> undefined
Advertisements
Oxidation of ketones involves carbon-carbon bond cleavage. Name the products formed on oxidation of 2, 5-dimethylhexan-3-one.
Concept: undefined >> undefined
What is the role of pyridine in the acylation reaction of amines?
Concept: undefined >> undefined
Assertion: Acylation of amines gives a monosubstituted product whereas alkylation of amines gives polysubstituted product.
Reason: Acyl group sterically hinders the approach of further acyl groups.
Concept: undefined >> undefined
In disaccharides, if the reducing groups of monosaccharides i.e. aldehydic or ketonic groups are bonded, these are non-reducing sugars. Which of the following disaccharide is a non-reducing sugar?
Concept: undefined >> undefined
Match the following enzyms given in Column I with the reactions they catalyse given in Column II.
| Column I (Enzymes) | Column II (Reactions) |
| (i) Invertase | (a) Decomposition of urea into NH3 and CO2 |
| (ii) Maltase | (b) Conversion of glucose into ethyl alcohol |
| (iii) Pepsin | (c) Hydrolysis of maltose into glucose |
| (iv) Urease | (d) Hydrolysis of cane sugar |
| (v) Zymase | (e) Hydrolysis of proteins into peptides |
Concept: undefined >> undefined
Which of the following polymers can have strong intermolecular forces?
(i) Nylon
(ii) Polystyrene
(iii) Rubber
(iv) Polyesters
Concept: undefined >> undefined
Which factor imparts crystalline nature to a polymer like nylon?
Concept: undefined >> undefined
Match the polymers given in Column I with their main applications given in Column II.
| Column I | Column II |
| (i) Bakelite | (a) Unbreakable crockery |
| (ii) Low-density polythene | (b) Non-stick cookwares |
| (iii) Melamine-formaldehyderesin | (c) Packaging material for shock absorbance |
| (iv) Nylon 6 | (d) Electrical switches |
| (v) Polytetrafluoroethane | (e) Squeeze bottles |
| (vi) Polystyrene | (f) Tyre, cords |
Concept: undefined >> undefined
Assertion: Polyamides are best used as fibres because of high tensile strength.
Reason: Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence, provide high tensile strength to polymers
Concept: undefined >> undefined
In which of the following structures coordination number for cations and anions in the packed structure will be same?
Concept: undefined >> undefined
Which one of the following compounds is more reactive towards SN1 reaction?
Concept: undefined >> undefined
Which of the following tests/reactions is given by aldehydes as well as ketones?
Concept: undefined >> undefined
Give reason for the following:
The product formed during SN1 reaction is a racemic mixture.
Concept: undefined >> undefined
A hydrocarbon (A) with molecular formula C5H10 on ozonolysis gives two products (B) and (C). Both (B) and (C) give a yellow precipitate when heated with iodine in presence of NaOH while only (B) give a silver mirror on reaction with Tollen’s reagent.
- Identify (A), (B) and (C).
- Write the reaction of B with Tollen’s reagent.
- Write the equation for iodoform test for C.
- Write down the equation for aldol condensation reaction of B and C.
Concept: undefined >> undefined
Write chemical test to distinguish between the following compounds:
Phenol and Benzoic acid
Concept: undefined >> undefined
What is the composition of Fehling's reagent?
Concept: undefined >> undefined
In which reaction mechanism carbocation is formed?
Concept: undefined >> undefined
Racemisation occurs in ______.
Concept: undefined >> undefined
