Rajnikant Bhikhubhai Mardia

5 Questions 9 Answers 0 Followers

Questions related from Rajnikant Bhikhubhai Mardia

What is the relationship between pKa value and nature oWhat is the range for pKa? What is the conclusion when pka value is negative and above 14?

What is the relationship between pKa value and nature oWhat is the range for pKa? What is the conclusion when pka value is negative and above 14? Some drugs pka is negative and for some molecules...

12 December 2018 9,072 0 View

When phenolic group shows chemical shift delta value near to 15 in proton NMR spectrum?

Phenolic group shows chemical shift delta value below or upto 10 in PMR spectrum due to intermolecular hydrogen bonding in specific solvents but it shifts sometimes upto 15. What can be the...

01 January 2018 7,163 5 View

Why carbon tetrachloride and carbon disulphide gives the vibrational bands in the mid IR spectrum although their dipole moments are zero?

CCl4 and CS2 are having dipole moment zero or no dipole. But both are having characteristic vibrational bands in the mid IR range. What can be the reason/s for that?

01 January 2018 4,786 2 View

How the components having 1 min retention time can be retained in BEH column with mobile phase containing 90% acetonitrile?

How the components can be retained for 1 min or less time in BEH column in UPLC with mobile phase containing 90% acetonitrile? How they can be retained for 1 min ? which can be the possible...

08 August 2016 6,921 3 View

When hydroxy proton shows chemical shift delta value above 10 in Proton NMR spectrum?

In some cases hydroxy protons give delta value above 10. So is there any fundamental related to this?

07 July 2016 8,012 4 View