QUESTION 1 Which of the following Brensted acids has the LOWEST (most negativel

Question

QUESTION 1 Which of the following Brensted acids has the LOWEST (most negativel pK, value? A) CF3CH2OH B) 2SH D) CH2FCH2SH QUESTION 2 The Dond, and one closed ring structure is al structural formula of Cycloalkynes with n number of carbons, one C C triple A) CnH2n-4 B) CnH2n-2 C) CnH2n D) CnH2n+2 QUESTION 3 Using solid lines to represent covalent bonds, and dotted lines for intermolecular attractions, which of the following describes a hydrogen bonding interaction? H-O-H O-H---O C-H--O QUESTION How many structural isomers (NOT including stereoisomers) are possible for the molecular formula of CsH12? B) 3 D) 5 QUESTIONS Which one of the following is NOT a secondary alkyl group? A) isopropyl B) 1-methylpropyl C) cyclobutyl D) tert-butyl

Explanation / Answer

1. Higher is the acidic nature smaller is the pKa value,

So, (A) CF3COOH has smaller pKa due to higher acidic nature which is due to prsence of electron with drawing fluorine atoms at alpha position of acidic hydrogen.

2.

General Molecular formula of saturated hydrocarbons is CnH2n+2

Introduction of a pi bond or a ring will decrease 2 hydrogen atoms.

Hence, for the given problem we need to decrease 6 hydrogen atoms to get the molecular formula,

SO, CnH2n-4

3.

Both A and C indicate the hydrogen bond.

Hydrogen bond is the electrostatic attraction between partia positive hydrogen atom and partial negative atom of more elecgronegative atom of same of different molecule.

4.

3 isomers are posible.

5.

(D) tert-butyl

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