Assertion: Phenol forms 2,4,6–tribromophenol on treatment with \(Br_2\) in carbon disulphide at 273K.
Reason: Bromine and carbon disulphide both are nonpolar.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
Reason: Bromine and carbon disulphide both are nonpolar.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
(d) Assertion is false but reason is true.
Assertion: Phenols give o- and p-nitrophenol on nitration with conc. \(HNO_3\) and \(H_2\)\(SO_4\) mixture.
Reason: —OH group in phenol is o–, p– directing.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
Assertion: Ethanol is a weaker acid than phenol.
Reason: Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
Assertion: Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.
Reason: Lewis acid polarises the bromine molecule.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
Assertion: o-Nitrophenol is less soluble in water than the m- and p-isomers.
Reason: m- and p- Nitrophenols exist as associated molecules.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
Assertion: Bond angle in ethers is slightly less than the tetrahedral angle.
Reason: There is a repulsion between the two bulky (-R) groups.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
Assertion: Boiling points of alcohols are greater than ethers of same molar mass.
Reason: Ethers can form intermolecular hydrogen-bonding with each other.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
Assertion: p-nitrophenol is more acidic than phenol.
Reason: Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
(a) Both assertion and reason are true and the reason is the correct explanation of assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
Assertion: 1 M glucose will have a higher boiling point than 2 M glucose.
Reason: Elevation in boiling point is a colligative property which depends upon the number of particles of solute in the solution.
A. If both Assertion and Reason are correct and reason is the correct explanation of Assertion .
B. If both Assertion and Reason are correct and reason is not correct explanation of Assertion
C. If Assertion is correct but Reason is incorrect.
D. If Assertion is incorrect and Reason is correct.
Assertion :-Water has high melting point.
Reason :- Water molecules are associated with hydrogen bonding.
a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
c) Assertion is correct statement but reason is wrong statement.
d) Assertion is wrong statement but reason is correct statement.
Assertion: D (+) -Glucose is dextrorotatory in nature.
Reason: D represents its dextrorotary nature.
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C. Assertion is correct statement but reason is wrong statement.
D. Assertion is wrong statement but reason is correct statement.
Assertion (A): Crystalline solids are anisotropic in nature.
Reason (R): Some of their physical properties show same electrical and optical properties in different directions in the same crystal.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion (A): The packing efficiency of simple cubic lattice is 52.4%.
Reason (R): The number of atoms per unit cell is 2.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion: An aqueous solution of NaCl freezes below 273 K.
Reason: Vapour pressure of the solution is less than that of the pure solvent.
A. If both Assertion and Reason are correct and reason is the correct explanation of Assertion .
B. If both Assertion and Reason are correct and reason is not correct explanation of Assertion
C. If Assertion is correct but Reason is incorrect.
D. If Assertion is incorrect and Reason is correct.
Assertion: Molarity of the solution changes with temperature.
Reason: Molarity is a colligative property.
A. If both Assertion and Reason are correct and reason is the correct explanation of Assertion .
B. If both Assertion and Reason are correct and reason is not correct explanation of Assertion
C. If Assertion is correct but Reason is incorrect.
D. If Assertion is incorrect and Reason is correct.