Q.69. Given below are two statements : Statement-I : [Figure: Glucose anomers] are two anomers of D-

Q: What is the correct answer for JEE Main Chemistry Q69?

The correct answer is A. Statement-I: Anomers are epimers that differ in configuration only at the anomeric carbon (the hemiacetal or hemiketal carbon). The two structures shown are $\alpha$-D-glucose and $\beta$-D-glucose, which are anomers. They differ in the configuration at $C_1$ (the anomeric carbon). Therefore, Statement-I is true. Statement-II: Let's examine the chiral carbons in the open-chain forms: For D-glucos

Q: Q.69. Given below are two statements : Statement-I : [Figure: Glucose anomers] are two anomers of D-(+)-glucose. Statement-II : The open chain forms of D-glucose and D-fructose contain three similar…

The correct answer is A. Statement-I: Anomers are epimers that differ in configuration only at the anomeric carbon (the hemiacetal or hemiketal carbon). The two structures shown are $\alpha$-D-glucose and $\beta$-D-glucose, which are anomers. They differ in the configuration at $C_1$ (the anomeric carbon). Therefore, Statement-I is true. Statement-II: Let's examine the chiral carbons in the open-chain forms: For D-glucos

Q: What are the options for this JEE Main Chemistry question?

A. Both Statement-I and Statement-II are true. · B. Both Statement-I and Statement-II are false. · C. Statement-I is true but Statement-II is false. · D. Statement-I is false but Statement-II is true.

Question

Q.69. Given below are two statements : Statement-I : [Figure: Glucose anomers] are two anomers of D-(+)-glucose. Statement-II : The open chain forms of D-glucose and D-fructose contain three similar chiral carbons at ,  and . In the light of the above statements, choose the correct answer from the options given below :

FirstInTest · Accepted Answer

Statement-I: Anomers are epimers that differ in configuration only at the anomeric carbon (the hemiacetal or hemiketal carbon). The two structures shown are $\alpha$-D-glucose and $\beta$-D-glucose, which are anomers. They differ in the configuration at $C_1$ (the anomeric carbon). Therefore, Statement-I is true.

Statement-II: Let's examine the chiral carbons in the open-chain forms:
For D-glucose: Chiral carbons are $C_2, C_3, C_4, C_5$. The configurations are $C_2(R), C_3(S), C_4(R), C_5(R)$.
For D-fructose: Chiral carbons are $C_3, C_4, C_5$. The configurations are $C_3(S), C_4(R), C_5(R)$.
Comparing the chiral carbons at $C_3, C_4, C_5$:
Glucose: $C_3(S), C_4(R), C_5(R)$
Fructose: $C_3(S), C_4(R), C_5(R)$
Indeed, the configurations at $C_3, C_4, C_5$ are identical in the open-chain forms of D-glucose and D-fructose. Therefore, Statement-II is true.

Since both statements are true, the correct option is (1).

Answer

Both Statement-I and Statement-II are true.

Answer

Both Statement-I and Statement-II are false.

Answer

Statement-I is true but Statement-II is false.

Answer

Statement-I is false but Statement-II is true.

Related Questionsin Chemistry

More from JEE Main

Browse Engineering Questions by Subject

Practice More JEE Main Questions