Consider the statements. I: AlCl3 exists as the bridged dimer Al2Cl6 in the vapour phase. II: In water it gives [Al(H2O)6]^3+ and Cl-. III: Anhydrous AlCl3 fumes in moist air. IV: AlCl3 acts as a Lewis base in Friedel-Crafts reactions. The number of correct statements is

JEE Advanced levelSingle correct optionDifficulty 3 of 3pb140

Consider the statements. I: $AlCl X_{3}$ exists as the bridged dimer $Al X_{2} Cl X_{6}$ in the vapour phase. II: In water it gives $[Al (H X_{2} O) X_{6}] X^{3 +}$ and $Cl X^{-}$ . III: Anhydrous $AlCl X_{3}$ fumes in moist air. IV: $AlCl X_{3}$ acts as a Lewis base in Friedel-Crafts reactions. The number of correct statements is

I, II and III are correct (the fumes are HCl from hydrolysis). IV is false:

AlCl X_{3}

is a Lewis acid, accepting a chloride to generate the electrophile. Three statements are correct.