Mumbai, Sept. 29 -- Indian stocks fell to their lowest level in almost six months on Monday as hopes of a US-Iran breakthrough faded, pushing crude oil further above $100 a barrel and deepening worries over higher interest rates. The Nifty 50 tumbled 1.6% to close at 22,780.25, its lowest level since April 2, while the Sensex fell 1.5%. Brent crude futures traded around $107 a barrel on Monday after touching a high of $108.83.P14...