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1. The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA?
A 1st
B 2nd
C 3rd
D 4th
2. 2nd carbon in DNA do not have OH group. Among the following the maximum covalent character is shown by the compound.
A FeCl2
B SnCl2
C  AlCl3
D  MgCl2
3. Which of the following statement is wrong?
A The stability of hydride increases from NH3 to BiH3 in group 15 of the periodic table.
B Nitrogen cannot from dπ - pπ bond.
C Single N – N bond is weaker than thesingle P – P bond.
D N2O4 has two resonance structures.
4. Phenol is heated with a solution of mixture of KBr and KBrO3. The major product obtained in the above reaction is :
A 2-Bromophenol
B 3-Bromophenol
C 4-Bromophenol
D 2, 4, 6-Tribromophenol
A 5.2 molal aqueous solution of methyl alcohol, CH3OH, is supplied. What is the mole fraction of methyl alcohol in the solution?
A 0.100
B 0.190
C 0.086
D 0.050

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