Assertion(A): Purine bases present in DNA are adenine and guanine.
Reason(R): The base uracil is present in DNA whereas the base thymine is present in RNA.

Both A and R are true and R is the correct explanation of A

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Both A and R are true but R is not a correct explanation of A

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A is true but R is false

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A is false but R is true

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Solution

The correct option is C A is true but R is false
Purine bases present in DNA are adenine and guanine, as they are derived from purine rings. The base uracil is present in RNA whereas the base thymine is present in DNA.

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Assertion (A): Electrophilic substitution reactions takes place in phenol than in nitro benzene

Reason (R): Hydrogen bonding is present in phenol but not in nitrobenzene

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