JEE Main levelSingle correct optionDifficulty 2 of 3sb030
Match the hydride in Column I with its description in Column II.
Column I: (P) LiH, (Q) BeHX2, (R) BX2HX6, (S) CHX4.
Column II: (1) saline (ionic) hydride, (2) polymeric covalent hydride, (3) molecular electron-deficient hydride, (4) molecular electron-precise hydride.
AP-1, Q-2, R-3, S-4
BP-1, Q-3, R-2, S-4
CP-2, Q-1, R-4, S-3
DP-1, Q-2, R-4, S-3
Answer: A
LiH is ionic. BeHX2 is a polymer with hydrogen bridges. BX2HX6 is a discrete molecule with too few electrons for normal bonds (electron deficient), and CHX4 is a discrete electron-precise molecule. So P-1, Q-2, R-3, S-4.