Yes, it depends on the country to be attacked.
But what about the aggressor? Does India possess thousands of nuclear weapons with a few hundred survivable ones?
If Pakistan does not have a huge amount of nukes and survivable delivery systems, India too does not have the means to attempt a decapitation strike. Pakistan does have deeply buried secured facilities for enhanced protection.
1) Those days are gone when submarine commanders had absolute authority and could launch at will. This is the age of real-time authenticated execution of orders. Just like a B-52 bomber cannot launch nuclear weapons at the crew's will, the soldiers in the battlefield can also not launch without authentication. Permissive Action Links is the keyword here.
2) Yes, you cannot. You are fearful of the enemy's response because it has hundreds of nuclear weapons at nearly ready-to-launch status at all times.
But can the same be said about India and Pakistan? I don't think so.
Again, India and Pakistan do not have that many nukes to ensure maximum survivability.
The only thing hampering the development of SLBMs by Pakistan is limited resources. But as far as land based weapons are concerned, they are survivable to some extent.
India and Pakistan have similar number of nuclear weapons and delivery systems , but what Indian does have and Pakistan does not, is 4 times bigger land area to disperse its present nuclear weapons.
And will very soon have all the worlds oceans to disperse considerable more number
Yes Indian and Pakistani weapons are dismantled kept separately to ward of accidental launch.But that scenario will also be changing soon..because in SSBN ...nukes are always in ready to fire mode.
A number of factors coupled with a certain scenario(as presented here).. exponentially increases chances of India surviving a nuclear war with Pakistan.
The factors are.
1) India has 4 times the land area and 7 times higher population..SO Pakistan will need launch atleast 4 times higher number of nuclear weapons to cause similar damage to India, as India need to destroy Pakistan.
2) All the Pakistani nuclear weapons are land based, Indian nuclear weapons are also land based but are dispersed over many times larger area ..hence much more difficult to eliminate in first strike.
3)Soon Indian weapons will sea based too, which will give India a assured second strike capability, where as Pakistan still very far from developing such a capability.
4) India will soon be deploying Missile defense systems covering major cities and military installations, which can take of atleast some of Pakistani launches.
The scenario:
Scenario as being discussed here previously. India send in its army into Pakistan, in response to a Pakistani terror strike or Kargil type misadventure in Indian and Pakistan responds by firing a tactical nuke or two on Indian IBGs.
Now as per Indian doctrine, India reserves a right to give a massive and puntive, retaliation against Pakistan.
Indian launches missile from SSBNs of Pakistani coast(giving Pakistani absolutely no warning at all) to take out known Pakistani launch sites, weapons site and command centers.
There is a possibility considerable number of Pakistani weapons and delivery systems will be taken out in such a pre-emptive nuclear strikes.
However for sure certain number of Pakistani weapons and missile will survive.
Some of which will take out by Indian missile defense batteries if launched ..some might leak through but ..damage to India, will nearly not be as severe, as to Pakistan.
This entire scenario is predicated on Pakistan launching small tactical nukes in their first strike and India following through with its current nuclear doctrine of massive nuclear retaliation in response to Pakistani using nuclear weapons against its forces. 
and i guess now you indian trollers would understand why PDF doesnt have an indian flag as its gonne be off the world map soon...
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