Question

STATEMENT-1 : Sucrose on hydrolysis gives glucose and fructose.
STATEMENT-2 : The formula of sucrose is $C_{12}{H}_{22}{O}_{11}$.

• A. STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
• B. STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
• C. STATEMENT-1 is True, STATEMENT-2 is False
• D. STATEMENT-1 is False, STATEMENT-2 is True

Answer 1

Answer: (B)

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1

Sucrose consists of 1 unit of glucose and 1 unit of fructose.
On hydrolysis, it gives glucose and fructose.
It's molecular formula = molecular formula of glucose + molecular formula of fructose - molecular formula of water
= $C_6{H}_{12}{O}_6$ + $C_6{H}_{12}{O}_6$ - $H_{2}O$
= $C_{12}{H}_{22}{O}_{11}$
So assertion and reason are both correct.
Now, reason is not a correct explanation of assertion.
Having a formula $C_{12}{H}_{22}{O}_{11}$ does not mean that glucose and fructose will be released on hydrolysis.
Consider for example maltose. It has same formulas as that of sucrose - $C_{12}{H}_{22}{O}_{11}$ but on hydrolysis, it gives 2 molecules of glucose. No fructose is released.
So, reason is not a correct explanation.