Home
Class 11
CHEMISTRY
The substituents which are deactivating ...

The substituents which are deactivating but ortho para directing in aromatic substitutions are `-NO , -CHO, -F , -Cl, -Br , -CH = CHCHO, - C_6H_5, - COCl, -NH_3` .

Text Solution

Verified by Experts

The correct Answer is:
5
Aromatic substitutions
Promotional Banner

Similar Questions

Explore conceptually related problems

Some meta directing substituents in aromatic substitution are given which one is most deactivating?

How many of the following alkynes on treatment with dilute H_2SO_4 in presence of Hg SO_4 give a methyl ketone ? HC -= CH, CH_3C -= CH, CH_3CH_2 C -= CH, CH_3C -= C CH_3 , C_6H_5C -= CH, C_6H_5C -= C CH_3 . CH_3CH_2C -= C CH_2CH_3, CH_3CH_2CH_2C -= CH, C_6H_5CH(OH)C-=CH

The relative rates of mononitration of C_6H_5 - Z , " where " Z = CH_3 - , - NO, - OH , Cl are

Among the following, the compounds which gives iodoform reaction with I_2 & NaOH is CH_3 CHO ,CH_2CH_2 OH ,C_6 H_5 CHO ,C_6 H_5 COCH_3 ,CICH_2 CHO ,ICH_2CHO ,CH_3 CH_2 CH_2 CHO ,CH_3 CH_3 COCH_3

Assign priority number to each of the following groups: (a) -CHO, -OH, -CH_(3), -CH_(2)OH (b) -CH = CH_(2), -CH_(2)CH_(3), - C_(6)H_(5), -CH_(3) (c ) (CH_(3))_(2)CH-,CI-,-CH_(2)CH_(2)Br

Predict the order of reactivity of the compounds in S_(N)1 and S_(N) 2 reactions . C_(6)H_(5)CH_(2) Br, C_(6)H_(5) CH (C_(6)H_(5)) Br , C_(6) H_(5) CH(CH_(3)) Br , C_(6)H_(5) C (CH_(3)) (C_(6)H_(5)) Br

Predict the order of reactivity of the following compounds in S_N1 and S_N2 reactions: (i) The four isomeric bromobutanes, (ii) C_6H_5CHBr, C_6H_5(C_6H_5)Br, C_6H_5CH(CH_3)Br and C_6H_5C(CH_3)(C_6H_5)Br .

The typical reaction of benzene and other aromatic compounds is electrophilic substitution. Presence of electron donating group activates the ring towards electrophilic substitution, while presence of electron withdrawing group deactivates the ring towards electrophilic substitution but at the same time activates the ring towards nucleophilic substitution. Some groups are predominantly meta directing and all of these are deactivating. Except halogen, most of the o- and p- directing groups are activating groups. (E.A.S = Electrophilic aromatic substation) The reaction of toluene with Cl_2 in presence of FeCl_3 gives predominantly:

Following is the list of four halides. Select correct sequence of decreasing order of reactivity for Spi reaction using the codes given below I) C_6H_5-underset(CH_3)underset(|)(CH)-Br " " II) C_6H_5 - CH_2 - Br III) C_6H_5-underset(CH_3)underset(|)(CH)-I " " iv) C_6H_5-CH_2-I