47. The major product obtained on treatment of \( CH _{3} CH _{2} CH ( F ) CH _{3} \) with \( CH _{3} O / CH _{3} OH \) is
(1) \( CH _{3} CH _{2} CH \left( OCH _{3}\right) CH _{3} \)
(2) \( CH _{3} CH = CHCH _{3} \)
[AIIMS-2005]
(3) \( CH _{2} CH _{2} CH = CH _{2} \)
(4) \( CH _{3} CH _{2} CH _{2} CH _{2} OCH _{3} \)