Organic Chemistry MCQ with Answers

Organic Chemistry MCQ with Answers

46) The electron attracting species in the following are:

Answer is:

−CN

Explanation:

The groups having double or triple bonds are electron attracting.

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

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⁻.

Answer is:

4.8, 9.3, 10.8

Explanation:

pK_a + pK_b = 14

49) The decreasing order of nucleophility is:

Answer is:

HS⁻ > RCOO⁻ > ROH > RCOOH

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

Answer is:

Strong mesomeric effect

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