Need perform hover on Electronics highlighted on below image
cd.get("http://flipkart.com/");
cd.manage().window().maximize();
Actions mobile = new Actions(cd);
WebElement electronics= cd.findElement(
By.xpath(".//*[@id='container']/div/header/div[2]/div/ul/li[1]/a/span"));
//electronics.click();
mobile.moveToElement(electronics);
mobile.build().perform();