19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Reduction of 2-butyne with sodium in liquid ammonia gives predominantly :
The product A, is (a) (b) (c) (d)
Acetylenic hydrogens are acidic because
CH CH CH
CH CH C CH
Consider the below reaction and identify the missing reagent/chemical (NEET 2021) + NaOH + ? CH CH COO Na Heat CH CH Na CO ->
The major product formed in dehydrohalogenation reaction of 2-Bromopentane is pent-2-ene. This product formation is based on (NEET 2021)
Identify the major product (a) (b) (c) (d)
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.
Assertion: Rates of nitration of benzene and hexadeuterobenzene are different. Reason: The C—H bond is stronger than the C—D bond.
Assertion: Friedel-Craft’s reaction is used to introduce an alkyl or acyl group in the benzene nucleus. Reason: Benzene is a solvent for Friedel-Craft’s alkylation of bromobenzene.
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.
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.
With respect to the conformers of ethane, which of the following statements is true? (NEET 2017)
The compound that will react most readily with gaseous bromine has the formula (NEET 2017) (a) C H (b) C H (c) C H (d) C H
In which of the following molecules, all atoms are coplanar? (NEET-II 2016) (a) (b) (c) (d)
Which of the following can be used as the halide component for Friedel–Crafts reaction? (NEET-II 2016)
In the reaction i NaNH /liq.NH ii CH CH Br H C CH X -> i NaNH /liq.NH ii CH CH Br Y -> X and Y are (NEET-I 2016)
The pair of electrons in the given carbanion, CH3C≡C–, is present in which of the following orbitals? (NEET-I 2016)
Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction? (NEET-II 2016) (a)
The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is (NEET-I 2016)
Consider the nitration of benzene using mixed conc. H SO and HNO . If a large amount of KHSO4is added to the mixture, the rate of nitration will be (NEET 2016)
Which of the following is not the product of dehydration of (NEET 2015) (a) (b) (c) (d)
In the reaction with HCl, an alkene reacts in accordance with the Markovnikov’s rule to give a product 1-chloro- 1-methyl-cyclohexane. The possible alkene is (NEET 2015) (a) (b)