Question

How did the social and economic reforms of the British alienate orthodox indians

Answer 1

For a long time Britishers refused to legislate on 'Sati' because they feared that it can be a reason of social revolt. Yet this was at odds with its self-proclaimed role as the force that introduced civilization to India. Therefore, one early compromise was to make an elaborate distinction between 'good' sati (scripturally sanctioned) and 'bad' sati. The first recorded enquiry about the practice took place in 1789. After some time Britishers started to crtisized Hindu customs openly. 'Sati', the practice of burning the widow in the funeral pyre of her husband. They banned the 'sati system.
Britishers legalize the widow remarriage. Schools were opened for girl child. English medium schools were started and English medium education was introduced especially by Christian Missionaries. 
All these actions created a suspicion in the minds of the Indians, especially Hindus and Muslims because this act was seen as a ploy to convert Hindus and Muslims to Christianity. 
The economic reforms to which the Indians heavily opposed included the Permanent Settlement of Bengal, which fixed the revenue at such high levels that the peasants and even the zamindars could not afford to pay the required amount. Ultimately they were forced to sell their lands and hence they became landless and bonded labourers. Permanent Settlement put the peasants at the mercy of landlords.

Answer 2

The social and economic reforms of the British alienated by the orthodox Indians. These people thought that British is interfering in their religious and social affairs and trying to covert them into Christianity. This caused their alienation towards British.

The Economic reforms of the British were against their interests. These reforms were for the development of Britain. It drained India and turned India exporter of raw material at cheap rates and a market for British finished goods. That is why these reforms alienated these people.