Question 115 of 512

CH3-CC-HCH3MgBrCH4 + (A)(ii) H2O/H+(i) CO2(B); (B) will be

(1) H3C-CH2-CH2-COOH                                (2) CH3-CC-CH3

(3) H3C-CC-COOH                                      (4) H3C-CH=CH-COOH