19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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: The addition of HBr on 2-butene gives two isomeric products. Reason: Addition of HBr on 2-butene follows Markownikoff’s rule.
For the formation of toluene by Friedal Craft reaction, reactants used in presence of anhydrous AlCl₃ are
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
Ethylbenzene with bromine in presence of FeBr₃, predominantly gives (a) (b) (c) (d)
An aromatic compound ‘X’ with molecular formula C₈H₁₀ on nitration gives one mononitro derivative and three dinitro derivatives. Compound ‘X’ would be
Assertion: A compound with delocalised electrons is more stable than that compound would be if all its electrons were localised. Reason: The extra stability, a compound gains as a result of having delocalised electron…
The most reactive nucleophile among the following is : (a) CH O (b) C H O
The correct structure of 4-bromo-3-methyl but-1-ene is
Which of the following compounds possesses the C—H bond with the lowest bond dissociation energy?
Hybridisation states of C in + CH and CH are (a) sp & sp
Which of the following represents the correct order of the acidity in the given compounds ?
Correct order of basicity of various nitrogen in
Which will not show geometrical isomerism ?
How many geometrical isomers of this cyclodecene are possible ?
Maximum enol content is in (a) (b) (c) (d)
Assertion : The carbocation CF CH is less stable than CF . Reason : In case of CF CH ,CF is strong electron withdrawing, therefore increases +ve charge whereas in CF , lone pair of ‘F’ overlap with vacant p-orbital of…
Assertion : Tropylium cation is aromatic in nature. Reason :The only property that determines its aromatic behaviour is planar structure.
Assertion: NF is a weaker ligand than N CH . Reason: NF ionizes to give Fions in aqueous solution.
Which of the following represents the given mode of hybridisation sp -sp -sp-sp from left to right ? (a) H C CH C N
The number of sigma electrons in toluene are
Among the following, the strongest nucleophile is : (a) C H SH (b) CH COO (c) CH NH (d) NCCH
The IUPAC name of is
Ethanol and dimethyl ether are
IUPAC name of is