www.ThinkITI.com

Home
MCQ
Search
Free Apps
Important
Study Groups
Contact Us
Policy

Home
MCQ
Objective Questions
GS
GS Set-1
Chemistry
Organic Chemistry
46

Organic Chemistry MCQ with Answers

46) The electron attracting species in the following are:

−CN

−NH₂

−NHR

−NHCOR

Answer is:

−CN

Explanation:

The groups having double or triple bonds are electron attracting.

Organic Chemistry MCQ with Answers

For more MCQ's Click Here

Related Organic Chemistry MCQ with Answers

47) The possible mechanism of addition reaction between ethene and bromine in non polar medium would be:

Free radical addition

Carbene addition

Electrophilic addition

Nucleophilic addition

Answer is:

Free radical addition

48) pK_a values of HCN, CH₃COOH and HF respectively are 9.2, 4.7 and 3.2. Evaluate pK_b for CN⁻, CH₃COO⁻ and F⁻.

9.2, 4.7, 16.0

4.8, 9.3, 10.8

7.2, 3.7, 3.2

2.2, 2.3, 3.8

Answer is:

4.8, 9.3, 10.8

Explanation:

pK_a + pK_b = 14

49) The decreasing order of nucleophility is:

RCOO⁻ > HS⁻ > RCOOH > ROH

HS⁻ > RCOO⁻ > RCOOH > ROH

HS⁻ > RCOO⁻ > ROH > RCOOH

RCOO⁻ > HS⁻ > ROH > RCOOH

Answer is:

HS⁻ > RCOO⁻ > ROH > RCOOH

50) Phenol is more reactive than benzene towards electrophilic substitution due to:

Strong mesomeric effect

Hyperconjugative effect

Inductive effect only

Hydrogen bonding

Answer is:

Strong mesomeric effect

Organic Chemistry MCQ with Answers

For more MCQ's Click Here