Class 12th

Assertion: All naturally occurring α− amino acids except glycine are optically active. 

Reason: Most naturally occurring amino acids have L- configuration. 

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.

Predict the reagent or the product in the following reaction sequence.

Assertion: ? - glycosidic linkage is present in maltose.

Reason: Maltose is composed of two glucose units in which C−1 of one glucose unit is linked to C−4 of another glucose unit.

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.

A colourless substance ' A′(C6H7 N) is sparingly soluble in water and gives a water soluble compound ' B ' on treatment with mineral acid. On reacting with CHCl3 and alcoholic potash 'A' produces an obnoxious smell due to the formation of compound ' C '. Reaction of 'A' with benzenesulphonyl chloride gives compound ' D ' which is soluble in alkali. With NaNO₂ and, ' A ' forms compound ' E ' which reacts with phenol in alkaline medium to give an orange dye ' F ' Identify compounds ' A ' to ' F '.

A hydrocarbon ' A ', (C₄H₈) on reaction with HCl gives a compound ' B ' (C₄H₉Cl), which on reaction with 1 mol of NH₃ gives compound ' C ', (C₄H₁₁ N). On reacting with NaNO₂ and HCl followed by treatment with water, compound ' C ' yields an optically active alcohol, ' D '. Ozonolysis of ' A ' gives 2 moles of acetaldehyde. Identify compounds 'A' to 'D'. Explain the reactions involved.

Assertion: Vitamin D can be stored in our body. 

Reason: Vitamin D is fat soluble vitamin.

(i) Assertion and reason both are correct statements and reason explains the assertion. 

(ii) Both assertion and reason are wrong statements. 

(iii) Assertion is correct statement and reason is wrong statement. 

(iv) Assertion is wrong statement and reason is correct statement. 

(v) Assertion and reason both are correct statements but reason does not explain assertion.

In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices:
(a) Both Assertion and Reason are wrong.
(B) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
(c) Assertion is correct but Reason is wrong.
(d) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(e) Assertion is wrong but Reason is correct.

Assertion (A): Acetanilide is less basic than aniline.

Reason (R): Acetylation of aniline results in decrease of electron density on nitrogen.

Assertion: D(+)− Glucose is dextrorotatory in nature.

Reason: ' D ' represents its dextrorotatory nature.

(i) Assertion and reason both are correct statements and reason explains the assertion.

(ii) Both assertion and reason are wrong statements.

(iii) Assertion is correct statement and reason is wrong statement.

(iv) Assertion is wrong statement and reason is correct statement.

(v) Assertion and reason both are correct statements but reason does not explain