D 41961 (Pages : 2) । Name.

Time -

bo

زم ام يع ہہ

൭9

10.

BER
12.

13.
14.

നാനി

രാ 1
FOURTH SEMESTER B.Se. DEGREE EXAMINATION, APRIL 2018
(CUCBCSS-UG)
Chemistry
CHE 4B 04—ORGANIC CHEMISTRY]
Three Hours . ~Maximum : 89 Marks
Section A

(Fill in the blanks and One word type questions.)

Answer all questions.
Hach question carries 1 mark,

Isomers formed by rotation about Single bonds are called

What are the hybridizations of carbons 1 and 2 respectively in the.following structure ?

ಹತ್ತ
The temporary displacement of 7× electrons to one of the bonded atoms is called ‏تحص‎

Heterolytic fission of C-C bond generates 1
The catalyst used in Friedal-Craft’s alkylation ig ‏ہے‎
‎Give an example of a carcinogenic Polycyclic arene,

The electrophile in aromatic nitration reaction ig ——___
Baeyer's reagent is an alkaline Solution of ‏ليك‎
‎Write the product formed in the reaction g

Br Br —Na >
‏ات‎

Write the Structure of an anti-a romatic compound,

(10x1=10 marks)
Section B (Short Answer Quesions)

Answer any ten questions.
Each question carries 2 marks.

Define metamerism with an example.

What is meant by enantiomeric excess ? Calculate the enantiomeric excess of a chiral Substance
with 70 % of one enantiomer and 30 % of the other.

Write the R and§ configurations of lactic acid,
Draw the most stable conformation of cyclohexane showing all the axial and equatorial hydrogens.

Turn over