MUNISH KAKAR’s INSTITUTE OF CHEMISTRY
BASICS OF ORGANIC ( WS # 2 )
Q1.
Write resonance structures of the following showing the movement of electrons by curved
arrows:
(i) Acetate ion
Q2.

(ii) CH3CH= C HCH 2
(d)
(c)
Classify the following molecules/ions as nucleophiles or electrophiles: HS-, BF3,

CH3CH2O-, (CH3)3N, Cl+, CH3 C =O, H2N:, NO 2
Nucleophiles : HS-, CH3CH2O-, (CH3)3N, H2N:

Electrophiles : BF3, Cl+, CH3 C =O, NO 2
Q3.
Identify the electrophilic centre in the following:
(i) CH3CN
(ii) H3C - I
Ans : (i) CH3CN
Q4.
(iii) CH3CHO
(ii) H3C - I
(iii) CH3CHO
Which of the following pairs of structures do not constitute resonance structures:
O
O
H3C
H3 C
C
(a)
CH2
C
CH2
&
(b) (CH3)2CO &
Ans : (b)
Q5.
Using curved arrows notation, show the formation of reactive intermediates when the
following covalent bond undergo heterolytic cleavage:
(a) CH3-CN
Q6.
(b) CH3-Cu
Classify the reagents shown in bold in the following equations as nucleophiles or
electrophiles:
(a) CH3COOH + OH- → CH3COO- + H2O (b) CH3CH2Br + SH- → CH3CH2SH + Br-
(c) C6H6 + CH3CO+ → C6H5COCH3
Ans : Nucleophiles : (a) , (b) and (d)
Q7.
Q8.
Electrophile : (c)
An electrophilic reagent is:
(a) Electron deficient species
(b) Electron rich species
(c) Negatively charged species
(d) A Lewis base
Which of the following carbocation will be the most stable? Where Ph represents phenyl )
(a) (CH3)2CH+
Q9.
OH
|
(d) CH3COCH3 + CN- → CH 3C  CH 3
|
CN
(b) Ph3C+
(c) CH2=CHCH2+
(d) CH3CH2+
Which of the following compound does not have only one type of hybrid carbon atoms?
S.C.O. No. 203, SECOND FLOOR, SECTOR 14, PANCHKULA. Phone : 9417655033, 9888019721
MUNISH KAKAR’s INSTITUTE OF CHEMISTRY
(a) HC≡C-C≡CH
(b) CH3-CH2-CH2-CH3 (c) CH3-C≡C-CH3 (d) CH2=CH-CH=CH2
Q10. Which out of the following series contains only nucleophiles?
(a) H2O, SO3, H3O+ (b) NH3, H2O, R-O-H (c) NH3, H2O, AlCl3 (d) CN-, SO3, OHQ11. Which of the following is not an electrophile?
(a) Carbocation
(b) SO3
(c) Carbene
(d) Thioalcohol ( R - SH )
Q12. What is the hybridization of central C-atom in trimethyl free radical?
(a) sp
(b) sp2
(c) sp3
(d) may be sp2 or sp
Q13. Which of the following is not a nucleophile?
(a) CN-
(b) OH-
(c) NH3
(d) BF3
Q14. Which of the following is an electrophile?
(a) CN-
(b) ROH
(c) AlCl3
(d) NH3
Q15. Which of the following is an example of elimination reaction?
(a) Chlorination of methane
(b) Dehydration of alcohol
(c) Nitration of benzene
(d) Hydroxylation of ethylene
Q16. In which of the following, all are nucleophiles?
(a) H2O, NO2+, (CH3)3N
(b) HS-, BF3, CH3C+=O
(c) SH-, C2H5O-, (CH3)3N
(d) NO2+, BF3, Cl+
Q17. The reaction
E
+ E+ →
(a) nucleophilic substitution
(b) electrophilic addition
(c) electrophilic substitution
(d) elimination reaction
S.C.O. No. 203, SECOND FLOOR, SECTOR 14, PANCHKULA. Phone : 9417655033, 9888019721