[OBJECTIVE]
Subject: Chemistry-II (Organic Chemistry)
Time Allowed: 10 Minutes
Maximum Marks: 10
NOTE: Attempt this Paper on this Question Sheet only. Please encircle the correct option. Division of marks is given in front of each question. This Paper will be collected back after expiry of time limit mentioned above.
Part-I Encircle the right answer, cutting and overwriting is not allowed. (1×10=10)
1. Which of the following statement is most suitable to an SN1reaction?
a) The rate limiting step of the reaction involves the alkyl halide and the nucleophile.
b) The order of reactivity is methyl > 1 > 2 > 3 (i.e., methyl is most reactive)
c) The rate limiting step of the reaction involves only the alkyl halide.
d) Attack of nucleophile on substrate from rear would give product with inverted configuration.
2. Conversion of an optically active compound into an equimolar mixture of enantiomers is known as:
a) Tautomerization b) Racemization
c) Epimerization d) None of them
3. How many stereoisomers are possible for given compound?
a) C1 sp2, C2 sp3, N sp3 b) C1 sp2, C2 sp2, N sp3
c) C1 sp2, C2 sp2, N sp2 d) C1 sp2, C2 sp3, N sp2
6. Which of the following is not a meta director.
a) CN b) OH
c) COOH d) CHO
7. How many pi molecular orbital are present in molecular presentation of benzene.
a) 8 b) 2
c) 4 d) 6
8. The reaction of benzene with an acid chloride in presence of lewis acid as catalyst is known as
a) Perkin Reaction b) Friedel Craft acylation
c) Wurtz reaction d) Williamson’s synthesis
9. The oxidation of isopropyl alcohol with Cr3O in Glacial CH3COOH would yield
a) Propane b) Propanol
c) Propanone d) Propanoic acid
10. Which one of the following molecules has a dipole moment?
a) CS2 b) CHCl3
c) CCl4 d) O2
[SUBJECTIVE]
Subject: Chemistry-II (Organic Chemistry)
Time Allowed: 2 Hours 45 Minutes
Maximum Marks: 50
NOTE: ATTEMPT THIS (SUBJECTIVE) ON THE SEPARATE ANSWER SHEET PROVIDED.
Part-II Give short answers of the following. (20)
Q#1: Why aniline is less basic than cyclohexylamine
Q#2: Explain Torsional strain with example.
Q#3: Why ethanol has higher boiling point than that of dimethyl ether.
Q#4: Draw all conformers of |-tert-butyl-4-methylcyclohexane and point out most stable conformer and give reason.
Q#5: Why tertiary alcohol reacts with HBr faster than secondary alcohol.
Q#6: Why o-hydroxybenzoic acid is more acidic than p-hydroxybenzoic acid.
Q#7: How will you convert C2HsBr into propane
Q#8: How could you differentiate between nonaromatic and antiaromatic by huckel rule.
Part-III Give brief answers of the following. (30)
Q#1: How will you convert followings.
(i) vic-dihalide into 1-propyne (ii) 2-butene into cis-butane-2,3-dio]
(iii) Prop-1-ene into propane (vi) Prop-l-ene into 3-bromoprop-1-ene
(v) Prop-1-ene into 1-bromopropane (vi) Ethylene oxide into ]-propanoi
Q#2: Design suitable syntheses of the following compounds starting from benzene. Show all the steps in each case.
(i) Benzophenone (ii) 4-bromo-3-nivrohenzoie acid (iii) Phthalic anhydride
Q#3: Explain the difference between:
(i) Conjugation and hyperconjugation (ii) Resonance and tautomerism
(iii) Constitutional isomerisin. and Stereoisomerism (iv) Center of symmetry and axis of symmetry
Q#4: Explain SN1 mechanism with examples.
Q#5: Draw both the geometrical isomers for the following compounds and assign Z or E to each of them.
(i) 2-pentene (ii) 3-methyl-2-pentene (iii) 2-lodo-2-butene
(iv) 1-Bromo-1 ,2-dichloroethylene (v) Maleic acid
[OBJECTIVE]
Subject: Organic Chemistry
Time Allowed: 15 Minutes
Maximum Marks: 10
NOTE: Attempt this Paper on this Question Sheet only. Please encircle the correct option. Division of marks is given in front of each question. This Paper will be collected back after expiry of time limit mentioned above.
Part-I Encircle the right answer, cutting and overwriting is not allowed. (10)
[SUBJECTIVE]
Subject: Organic Chemistry
Time Allowed: 2 Hour and 45 Minutes
Maximum Marks: 50
NOTE: ATTEMPT THIS (SUBJECTIVE) ON THE SEPARATE ANSWER SHEET PROVIDED.
Part-II Give Short answers, Each question carries equal marks. (20)
