Given below are two statements: One is labelled as Assertion A an… - Vidyadip

MCQ

Given below are two statements: One is labelled as
Assertion A and the other is labelled as Reason R:
Assertion A: $pK _{ a }$ value of phenol is 10.0 while that of ethanol is 15.9.
Reason R: Ethanol is stronger acid than phenol.
In the light of the above statements, choose the correct answer from the options given below:

✓
A is true but R is false.
B
A is false but R is true.
C
Both A and R are true and R is the correct explanation of A.
D
Both A and R are true but R is NOT the correct explanation of A.

✓

Answer

Correct option: A.

A is true but R is false.

(A)
Phenol is more acidic than ethanol because conjugate base of phenoxide is more stable than ethoxide.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A solution of potassium ferrocyanide would contains ...... ions

Order of acidic nature

Assertion : Benzene removes a butter stain from a table cloth.

Reason : Butter has an affinity towards benzene.

At $527\,^oC$ the reaction given below has $K_c= 4$

$N{H_3}(g)\, \rightleftharpoons \,\frac{1}{2}{N_2}(g)\, + \,\frac{3}{2}{H_2}(g)$

What is the $K_P$ for following reaction ?

$\,\,{N_2}(g)\, + \,3{H_2}(g) \rightleftharpoons 2N{H_3}(g)$

Which of the following is a heterocyclic compound

Choose the correct statement:

A distinctive and characteristic functional group of fats is

An unknown compound ‘$D’,$ first oxidised to aldehyde and then acitic acid by a dilute solution of${K_2}C{r_2}{O_7}$ and ${H_2}S{O_4}$. The unknown compound $‘D$’ is

Which one has the highest boiling point

The reaction of an ester $RCOOR'$ with an alcohol $R''OH$ in the presence of an acid gives