Which is most stable ortho meta para?

Carbanion II is most stable as it contains an electron-withdrawing nitro group(−NO2) at the para position which increases the stability of carbanion. Carbanion II also contains an electron-withdrawing nitro group(−NO2)but it is present at meta position so it is least stable than carbanion IV.

Is ortho or para more 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 meta the most stable?

Bottom line: the meta carbocation intermediate is more stable than either the ortho– or the para- intermediates.

Is meta position unstable?

In case of nitrobenzene +ve charge developed at meta position is highly unstable the canonical structure but delocalisation of +ve charge in anilin, positive charge developed at the ortho and para positive which is stable canonical structure so, meta attack on aniline is more stable.

Which is the most stable Arenium Carbocation?

Which is the most stable arenium carbocation:a)b)c)d)Correct answer is option ‘C’.

Is BR electron withdrawing?

Nitro groups are electron-withdrawing groups, so bromine adds to the meta position. The main point to remember here is that electron-donating groups direct substitution to the ortho and para positions, while pi electron-withdrawing groups direct substitution to the meta position.

Is F Ortho para directing?

For nitration, for example, fluorine directs strongly to the para position because the ortho position is inductively deactivated (86% para, 13% ortho, 0.6% meta).

Which sigma complex is most stable?

So, 3-methoxy-6-nitrocyclohexa-2,4-dien-1-ylium is a more stable sigma complex.

Why phenols are ortho para directing?

The hydroxyl group attached to the aromatic ring in phenol facilitates the effective delocalization of the charge in the aromatic ring. Thus, it stabilizes the arenium ion through resonance. The hydroxyl group also acts as ortho para directors.

What do ortho meta and para mean in chemistry?

Updated September 29, 2018. The terms ortho, meta, and para are prefixes used in organic chemistry to indicate the position of non-hydrogen substituents on a hydrocarbon ring (benzene derivative). The prefixes derive from Greek words meaning correct/straight, following/after, and similar, respectively.

Which is more stable position, ortho or para?

So there are groups which give directive influence towards ortho-para and are activating (eg. -OH,-OR, -NR2, -NHR etc.) while some are deactivating the ortho-para positions (groups with dual effect eg. -N=O) and even some are meta deactivating groups ( -I groups, -M groups, -H groups) .

Is the list of ortho, para, and meta-directors the same?

If you look through the list of ortho- , para- directors, you might recognize that many of them are also activating groups. Likewise, the list of meta- directors (nitro, CF3, cyano) is like a who’s who of deactivating groups. If you’re a real nerd, you could even make a 2 × 2 matrix, like this:

Which is the most stable position in a benezene ring, ortho, meta or?

On an unsubstituted benzine ring there are no meta, ortho or para positions, moreover each position is of equal activity, so that all positions are equally stable. In the case of a mono-substituted benzine ring the stability of each position depends upon the substituent.