19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Assertion: Rates of nitration of benzene and hexadeuterobenzene are different. Reason: The C—H bond is stronger than the C—D bond.
Assertion: Alkyl benzene is not prepared in good yield by Friedel-Craft’s alkylation of benzene. Reason: Alkyl halides are less reactive than acyl halides.
Which of the following statements is true ?
Match the column I with column II and mark the appropriate choice. Column I Column II (A) n-butane 2-methylpropane (i) Free radical substitution (B) hv CH Cl CH Cl → (ii) Wurtz reaction (C) RCOONa + soda lime RH (iii)…
In the given reactions : Br Na,ether Na,ether (i)CH Br X Y Z hv Br NaOH NaOH (ii)CH COOH X Y Z CaO hv → → → → → → Identify X, Y and Z. X Y Z
When hydrochloric acid gas is treated with propene in presence of benzoyl peroxide, it gives.
The reagent is Reagent R CH CCl R R C C R →
Consider the following statements : A hydrocarbon of molecular formula C₅H₁₀ is a I. monosubstituted alkene II. disubstituted alkene III. trisubstituted alkene Which of the following statement(s) is(are) correct?
Which one of the following reactions is expected to readily give a hydrocarbon product in good yields? (a) Electrolytic RCOOK oxidation → (b) Br₂ RCOO Ag → (c) Br₂ RCOO Ag →
When 3, 3-dimethyl 2-butanol is heated with H₂SO₄, the major product obtained is
In the presence of platinum catalyst, hydrocarbon A adds hydrogen to form n-hexane. When hydrogen bromide is added to A instead of hydrogen, only a single bromo compound Is formed. Which of the following is A? (a) CH …
A hydrocarbon A on chlorination gives B which on heating with alcoholic potassium hydroxide changes into another hydrocarbon C. The latter decolourises Baeyer's reagent and on ozonolysis forms formaldehyde only. A is
CH CH CH
Reduction of 2-butyne with sodium in liquid ammonia gives predominantly :
Which is not aromatic compound? _
Which of the following sequence of reactions (reagents) can be used for the conversion of C₆H₅CH₂CH₃ into C₆H₅CH=CH₂?
An aromatic compound ‘X’ with molecular formula C₈H₁₀ on nitration gives one mononitro derivative and three dinitro derivatives. Compound ‘X’ would be
Ethylbenzene with bromine in presence of FeBr₃, predominantly gives (a) (b) (c) (d)
Which among the following groups when attached to benzene ring will direct the incoming electrophile predominantly to the meta position? (I) – CH₃ (II) –CH₂Cl (III) (IV) –CCl₃ (V) –NHCOCH₃
For the formation of toluene by Friedal Craft reaction, reactants used in presence of anhydrous AlCl₃ are
Assertion: The addition of HBr on 2-butene gives two isomeric products. Reason: Addition of HBr on 2-butene follows Markownikoff’s rule.
Assertion:1-butene on reaction with HBr in the presence of a peroxide produces 1-bromobutane. Reason: It involves the formation of a primary radical.
Assertion: Alkynes are more reactive towards nucleophilic addition reaction as compared to alkenes. Reason: Alkynes contain two pi bonds, while alkenes have only one bond.
Which is the most suitable reagent among the following to distinguish compound (3) from rest of the
CH C C CH