He is as clever if not cleverer than his brother.
Ranjeet is as fast as or perhaps faster than Rohit.
Are both these sentences correct?
As per Wren And Martin High School English Grammar And Composition (BY N.D.V. PRASADA RAO S. CHAND) The first sentence is better like this:
He is as clever as his brother, if not cleverer.
Or like this:
He is as clever as, if not cleverer than, his brother.
(Chapter No-22 Conjunction.Page 255, example: This is as good as that, if not better.)
Now in second sentence conjunction OR has been used so can I use the punctuation comma here too? If I can, then how can the 2nd sentence be right?