Assertion (A) & Reason (B) MCQ

Question 11 Mark

Assertion $(A): (CH_3)_3C-O-CH_3$ gives $(CH_3)_3C-I$ and $CH_3OH$ on treatment with $HI.$
Reason $(R):$ The reaction occurs by $S_N1$ mechanism.

Answer

$(CH_3)_3C-O-CH_3$ gives $(CH_3)_3C-I$ and $CH_3OH$ on treatment with HI. The reaction occurs by $S_N1$ mechanism.

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Question 21 Mark

Assertion (A): Vitamin C cannot be stored in our body.
Reason (R): Vitamin C is fat soluble and is excreted from the body in urine.

Answer

(c) Assertion (A) is true, but Reason (R) is false.
Explanation: In a tetrapeptide, there are four amino acids connected by three peptide bonds

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Question 31 Mark

Assertion $(A):$ Oximes are less acidic than hydroxyl amine.
Reason $(R):$ Oximes of aldehydes and ketones show geometrical isomerism.

Answer

Oximes are more acidic because, there is a delocalisation of $\pi$ electrons $($i.e. resonance$)$ and it stabilises it and its conjugate acid. But no such resonance exists in hydroxyl amine base $(NH_2O^-).$

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Question 41 Mark

Assertion (A): Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason (R): Alkyl halides are less reactive than acyl halides.

Answer

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Chemistry Assertion (A) & Reason (B) MCQ

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