Among the following, the compound which has highest boiling point is :
Boiling point depends upon intermolecular forces, favoured by no. of C-atoms & decreases with increases in branching
Propane can be best prepared by the reaction :
Corey-House reaction follows mechanism, which is used for preparation unsymmetrical alkanes.
Which statement is incorrect about free radical halogenation of alkanes?
Organic peroxides favour free redical mechanism
Consider the following reaction :
The major products formed in this reaction are :
In the presence of peroxides, free radical mechanism or homolytic cleavage is favoured.
NH2 - NH2 acts as reducing agent & gives syn addition of H - atoms
is a conjugated diene which gives 1,4-addition of H2
Halogen derivatives, in the presence of Na & dry ethetr gives W urtz reaction following free radical mechanism
Major product :
Conc. H2SO4 is used as dehydrating agent for alcohols following carbocation mechanism Hence, it is associated with rearrangement.
The Major product the following reaction is :
A : Intramolecular W urtz reaction
Which of the following alkenes is most reactive towards electrophilic addition reaction?
Electroph ilic addition is favoured by nucleophilic nature of alkenes, (c) has 6α-H , which increases nu cleophilicity
-OCH3 has +R-effect, so, benzyl carbocation is more stable
Alkenes are more reactive than alkynes, but in vinylacetylene, HCl is added on alkyne as conjugated diene is formed which is more stable
NBS → free radical bromination
KOH(alc) → Dehydro halogention
Hg(OAc)2 ,PhCH2OH → Mark. addition of alcohol
Exocylic π-bond is more reactive than endocyclic π-bond
Addition of Cl2+H2O is equivalent to HOCl, where Cl+ & OH- are added by Mark, rule
Diborane gives anti-Mark addition of H & OH, where H belongs to diborane & OH from oxidation
HCHO acts as electrophile in the presence of H+ ion.
Reaction shows carbocationc rearrangement by H- shift
Rates of hydrohalogenation of the following alkenes are :
Hydrohalogenation follow electrophilic addition on nucleophilic alkene
Br2 forms cyclic halonium ion which reacts with lone pair of N.
Conjugated dienes give Diels-Alder reaction with alkenes, which is known as cyclo-addition or (4+2) addition. It involves syn addition
Which of the following compounds will show aromatic character?
Aromatic compounds are cyclic and planar following Huckel’s rule
Which of the following species is not aromatic?
It is anti-aromatic
Among the compounds the order of decreasing reactivity towards electrophilic substitution is :
_CH3 shows hyperconjugation, -OCH3 shows +R-effect & -CF3 shows inverse hyperconjugation
In the given reaction ;
-OH is +R & -COOH is -R, So, nitration is governed by -OH group
H2SO4 protonates isobutylene & ter. carbocation is formed where -OCH3 is +R substituent
compound C will be :
The major product formed in the reaction :
H3PO2 is a reducing agent, it reduces Ph N2+ benzene