Wednesday, 21 December 2016

IPU BTech Semester 1: Organic Chemistry - End Term Q Paper (December 2014)

END TERM EXAMINATION
BTech/MTech 
Semester 1
Dec 2014-Jan 2015

Organic Chemistry

BA 117
IPU BTech Semester 1: Organic Chemistry - End Term Q Paper (December 2014)


Time: 3 Hrs MM: 60

Note: Attempt any five questions. All parts of a question must be attempted in continuation.


Q1:
(a) What is inductive effect? Arrange the following acids in order of their increasing acidic strength ClCH2COOH, CL2CHCOOH, CCl3COOH. (3)

(b) Explain intermolecular and intramolecular hydrogen bonding giving suitable examples. (3)

(c) Give the Newman projection formulae of confirmations of n-Butane and their increasing order of stability.  (3)

(d) What is geometrical isomerism? Which out of the following do not exhibit Geometrical isomerism: (3)
Propylene
Pentene-1
Butene-2
3,4-dimethyl-3-hexene




Q2:
(a) Explain the mechanism of hydroboration oxidation of alekenes. (3)

(b) What is Satyzeff's rule? Explain with a suitable example. (3)

(c) Which type of alkynes are acidic in nature? Arrange Ethane, Ethene and Acetylene in the decreasing order of their acidic strength. (3)

(d) Explain why peroxide effect is not observed in case of HCl and HI during their addition to alekenes? (3)


Q3:
(a) Explain the mechanism of SN2 reaction of alkyl halides. Also explain the order of reactivity of primary, secondary and tertiary halides. (6)

(b) Explain the mechanism of acidic dehydration of Ethanol. (3)

(c) Explain the term de-hydrogenation with suitable example. (3)


Q4:
(a) Write IUPAC names of the following:
CH2-CH=CH-CH2-Br
OH-CH2-CH2-CH=CH2
CH3-CH=CH-CH3-CHO
NH2CH2CH2CH2COOH

(b) Write the structural formulae of the following compounds: (4)
Hex-2-en-4-ynoic acid
butan-2-amine
4-Methylpent-3-en-2-one
1-Bromo-3-chlorobenzene

(c) Out of Methyl amine, Dimethyle amine and trimethyl amine which is more basic and why? (4)


Q5: Give the mechanism of any four of the following reactions with suitable example: (3x4 =12)
(a) Friedal Craft's alkylation

(b) Aldol condensation

(c) Ozonlysis

(d) Diazotization

(e) Nitration of benzene

(f) Alyllic substitution


Q6: (a) Predict the product of the following reactions: (8)
(i) O3
C6H5 - CH≡CH2 --------------⟶
(ii) Zn/H2O

NaBH4
CH3-CH=CH-CHO ---------------⟶

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