Consider the following groups : − CHO , − Br , − O C 2 H 5 , − C ( C H 3 ) 3 , − O − , − C ≡ N , − NHC H 3 (a) How many groups can show –M effect when attached to a conjugated system ? (b) H

Question

Consider the following groups : − CHO , − Br , − O C 2 ​ H 5 ​ , − C ( C H 3 ​ ) 3 ​ , − O − , − C ≡ N , − NHC H 3 ​ (a) How many groups can show –M effect when attached to a conjugated system ? (b) How many groups can show +M effect when attached to a conjugated system ? (c) How many groups can show +I effect ? (d) How many groups can show –I effect ? If the answers of parts (a), (b), (c) and (d) are 1, 2, 3 and 4 respectively, write 1234 in the answer sheet (a four-digit integer).

TestHub · Accepted Answer

(a) –M: − CHO and − C ≡ N . So 2. (b) +M (lone pair on the atom attached to the system): − Br , − O C 2 ​ H 5 ​ , − O − and − NHC H 3 ​ . So 4. (c) +I: − C ( C H 3 ​ ) 3 ​ (alkyl group) and − O − (negative charge). So 2. (d) –I: − CHO , − Br , − O C 2 ​ H 5 ​ , − C ≡ N and − NHC H 3 ​ (all have an electronegative atom or sp/s p 2 carbon bonded to the system). So 5. Answer: 2425.

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