CS/B.Sc (H)/BT/GEN/Micro. Bio./Mol. Bio./SEM-4/CH-401/2013
2013
CHEMISTRY
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
GROUP – A
( Multiple Choice Type Questions )
1. Choose the correct alternatives for any ten of thefollowing :
10 × 1 = 10
i) Grignard reagent is used for preparation of
a) Alkanes b) Alkenes
c) Alkynes d) All of these.
ii) For a reaction catalyst changes
a) activation energy b) free energy
c) equilibrium constant d) none of these.
iii) Solubility of iodine in ethanol is
a) 15 ® C b) 18 ® C
c) 20 ® C d) 17 ® C.
iv) Each turn of α-helix contains
a) 3·6 amino acid b) 3·5 amino acid
c) 3·2 amino acid d) 3·3 amino acid.
v) Iodine is used to activate
a) Aluminium b) Magnesium
c) Titanium d) Sodium.
vi) 4-toluene sulphonyl chloride is used as a reagent in
a) Curtius rearrangement
b) Neber rearrangement
c) Lossen rearrangement
d) both (b) & (c).