std 6 sanskrut ch 3

Basic question on formation OF quadratic equation || 6 std. graph OF quadratic polynomial

What are STDs? Name two STDs. How can they be prevented?

STD stands for

What is STD? Write the preventive measures of STDs

(a) Expand STDS (b) Cite any two examples for STDs. (c) Suggest any two methods for the prevention of STDs.

All reproductive tract infections RTIs are STDs, but all STDs but all STDs are not RTIs. Justify with example

Total number of the following ethers that can be prepared by Williamson synthesis is : C_(6)H_(5)CH_(2)OC_(6)H_(5),C_(6)H_(5)OC_(6)H_(5),(CH_(3))_(3)COCH_(2)CH_(3),(CH_(3))_(3)COC(CH_(3))_(3),C_(6)H_(5)OCH_(2)CH_(3),CH_(3)OCH_(2)CH_(3)

A: CH_(3)-CH-CH_(3) has 6. hyperconjugative hydrogens while CH_(3)-CH-CH_(2) -CH_(3) has 5 hyperconjugative hydrogens. R: CH_(3)-CH-CH_(3) is more stable than CH_(3)-CH-CH_(2)- CH