Assertion (A): There is no reaction known for which `DeltaG` is positive, yet it is spontaneous.
Reason (R ) : For photochemical reaction, `DeltaG` is negative.

For a chemical reaction, DeltaG will always be negative if,

Why DeltaG is positive for photochemical reaction ?

For a spontaneous reaction, DeltaG should be :

Assertion (A) : Many of photochemical changes have positive sign of Delta G , yet they are spontaneous Reason (R) : The activation energy in photochemical reaction is provided by light energy.

Assertion (A) : Photochemical reactions always occur in the presence of light. Reason (R) : Photochemical reactions do not require activation energy.

When DeltaG is positive, the reaction is not spontaneous. Then to make such reaction spontaneous, which method is followed?