How many structural isomers does C4H9Br?
How many structural isomers does C4H9Br?
four isomeric
How many isomers are possible for c4h8o?
10 isomers
Which isomer of C4H9Br is optically active?
Bromo butane
How many isomers does Bromobutane have?
four
Which compound is least reactive for nucleophilic addition reaction?
Benzaldehyde
Which one of the following is most reactive towards electrophilic reagent?
o-hydroxy toluene
Which one of the following is most reactive towards water?
Reactivity series of metals
| Order of reactivity | Metal | Reactions with water or steam |
|---|---|---|
| Second most reactive | sodium (Na) | vigorous reaction with cold water |
| Third most reactive | calcium (Ca) | less vigorous reaction with cold water |
| least reactive | magnesium (Mg) | slow reaction with cold water, vigorous with hot water |
Why is toluene more reactive than benzene?
Toluene and Phenol are more reactive than benzene since their groups add electron density to the ring. These different forms of donation increase the electron density of the ring which makes them more reactive in electrophillic substitution than benzene.
Which compound is most reactive towards nitration?
toluene
Who is more reactive benzene or nitrobenzene?
Notice that nitrobenzene is less reactive than benzene because the nitro group is a deactivating substituent. Notice also that meta-substitution reactions on nitrobenzene are faster than para-substitution reactions because the nitro group is a meta-directing group.
Which is more reactive chlorobenzene or benzene?
As a result of which the electron density of the aromatic ring decreases and deactivates the ring. Chlorobenzene is less reactive than benzene towards electrophilic substitution reaction. Hence chlorobenzene is ortho para deactivator and is less reactive than benzene.
Which is more reactive chlorobenzene or fluorobenzene?
This negatively charged complex will be more stable in fluorobenzene as compared to chlorobenzene because of high -I effect of Fluorine. So due to stablisation of product intermediate reaction fluorobenzene is more reactive than chlorobenzene.
Why Fluorobenzene is more reactive than chlorobenzene?
It is the stronger resonance contribution from this effective electron donating resonance interaction with fluorine that makes fluorobenzene more reactive towards electrophilic aromatic substitution than chlorobenzene.
Which is least reactive in electrophilic substitution?
Benzenesulphonic acid
Which Halogen is most deactivating?
Halogens (F, Cl, Br, I) Are Deactivating Not all groups capable of pi donation are activating groups. For example, halogens (F, Cl, Br, I) tend to be deactivating.
Is ortho or para favored?
The O-CH3 Group is an ortho, para Director This causes the ortho and para products for form faster than meta. Generally, the para product is preferred because of steric effects.
Is OCH3 activating or deactivating?
Any group with decreases the rate (relative to H) is called adeactivating group. Common activating groups (not a complete list): Alkyl, NH2, NR2, OH, OCH3, SR. Common deactivating groups (not a complete list): NO2, CF3, CN, halogens, COOH, SO3H.
Is Nitro an electron withdrawing group?
Numerous studies on nitro group properties are associated with its high electron-withdrawing ability, by means of both resonance and inductive effect.
Is phenol an electron withdrawing group?
The phenol acid therefore has a pKa similar to that of a carboxylic acid, where the negative charge on the conjugate base is also delocalized to two oxygen atoms. The ketone group is acting as an electron withdrawing group – it is ‘pulling’ electron density towards itself, through both inductive and resonance effects.
Is BR electron donating or withdrawing?
| Electronic Effect | Examples | Activation Effect |
|---|---|---|
| donation – inductive effect | -Alkyl | activating |
| donation – conjugation, withdrawal – inductive effect | -F, -Cl, -Br, -I | deactivating |
| withdrawal – inductive effect | -CF3 | deactivating |
| withdrawal – conjugation | -NO2, -CN | very deactivating |