19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. A is (NEET 2018) (a) CH…
A bromoalkane ‘X’ reacts with magnesium in dry ether to form compound ‘Y’. The reaction of ‘Y’ with methanol followed by hydrolysis yield an alcohol having molecular formula, C4H10O. The compound ‘X’ is (AIIMS 2018)
Assertion (A): The boiling points of alkyl halides decreases in the order RI > RBr > RCl > RF Reason (R): The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarb…
Alc.KOH CH CH CH Br -> Final product is (JIPMER 2019)
Identify compound X in the following sequences of reactions: (NEET 2020) (a) (b) (c) (d)
Consider the following (I) (II) (III) (IV) when attached to sp 3 -hybridized carbon, their leaving group ability in nucleophilic substitution reactions decreases in the order:
Which of the following statements is correct about Retention / inversion of configuration during the course of a reaction? (a)Configuration is retained if reagent attacks from the same side of leaving group. (b)Config…
Which is the best solvent to use for the solvolysis reaction of t-butyl chloride?
The compound most reactive towards SN1 reaction is
Which of the following is an example of SN2 reaction? (a) CH Br OH CH OH Br -> (b) CH3 C CH3 CH3 Cl - Cl- CH3 C CH3 CH3 + Cl CH3 C CH3 CH3 + OH CH3 C CH3 CH3 OH H2O .. .. Θ Me-O-CH -Cl Me-O-CH Cl Me-O=CH…
The organic chloro compound, which shows complete stereochemical inversion during an SN2reaction is
An SN2 reaction at an asymmetric carbon of a compound always gives
CH CD CH CHCD3 CH CD C CHCD CD CD CH CHCH3 CH CD CHCH2CD3 SOLID STATE The major product obtained when this substrate is subjected to E1 reaction will be (a) (b) (c)
Find the major product of the following reaction: (a) (b) (c) (d)
Debromination of meso dibromobutane will give the product as:
1-hexene is formed when methoxide reacts with
CH CH CH CH Br DMF CH CH O -> This reaction would follow which of the following pathway predominantly?
Which of the following is the best synthesis of compound shown? (a) (b) (c) (d)
Which of the following bases would give the best yield for the substitution product when reacted with 2-chloropropane?
Assertion: Heavy metal ions Ag + or Pb 2+ decrease SN1 reactivity. Reason : They aid ionisation of RX.
Assertion: In SN1 mechanism, the product with inversion of configuration is obtained in a higher amount compared to the product with the retention of configuration. Reason: Front side attack of nucleophile is hindered…
Assertion: Benzyl bromide when kept in acetone – water, produces benzyl alcohol. Reason: The reaction follows SN2 mechanism.
Which of the following compounds will undergo racemization when solution of KOH hydrolyses? (AIPMT 2014) (i) (ii) CH CH CH Cl (iii) (iv)
Which of the following reactions is an example of nucleophilic substitution reaction? (AIPMT 2009)
CH CH Br on treatment with LiAlH4 gives ethane gas while (CH3)3C-Br on same treatment gives H2 gas because (OJEE 2009) (a) the former is SN2 and latter is E2 reaction