Which is the correct sequence in the following properties. For the correct order mark `( T)` and for the incorrect order mark `( F) :`
`{:((a)"Acidity order ":SiF_(4) lt SiCl_(4) lt SiBr_(4) lt Sil,,
(b)"Melting point":NH_(3) gt SbH_(3) gt AsH_(3) gt PH_(3),,),
((c )"Boiling point " :NH_(3) gt SbH_(3) gt AsH_(3) gt PH_(3),
,(d)"Dipole moment order ":NH_(3) gt SbH_(3) gt AsH_(3) gt PH_(3),=,5):}`

Options

A. FTFT
B. TFTF
C. FFTT
D. FFTF

Answer

A

Explanation

(F): As the size of halogen atom increases crowding on Si atom will increase, hence, tendency of attack of Lewis base decreases.